Master the art of sentence construction with this comprehensive grammar guide. Learn to identify and correct common sentence errors.
Words have identity — each one belongs to a part of speech. But identity alone produces nothing. A noun sitting alone on a page, a verb floating in isolation — neither of these communicates anything. Communication requires structure. It requires arrangement. It requires a sentence.
A sentence is the fundamental unit of communication in English. It is the smallest grammatical structure that can express a complete, independent thought. Everything in English grammar — parts of speech, tenses, clauses, punctuation — ultimately exists in the service of one goal: the construction of clear, correct, meaningful sentences.
This chapter covers everything a serious student of English must understand about the sentence: what it is, what its essential parts are, how its structure is classified, how clauses combine, and how the sentence functions at the level of purpose and communication.
This chapter covers: Definition of a Sentence · Essential Parts · Types by Structure · Types by Purpose · Clauses · Phrases · Sentence Patterns · Common Errors
A sentence is a group of words that contains a subject and a predicate and expresses a complete thought. It begins with a capital letter and ends with appropriate punctuation — a full stop, a question mark, or an exclamation mark.
She runs every morning before work.
The meeting has been cancelled without explanation.
Did anyone call while I was in the meeting?
What an extraordinary performance that was!
Each of these is a sentence. Each has a subject — someone or something being discussed. Each has a predicate — something being said about that subject. And each expresses a complete, independent thought that does not require anything else to make sense.
A group of words that lacks a subject, lacks a predicate, or fails to express a complete thought is called a fragment — not a sentence. Understanding the difference between a sentence and a fragment is one of the most important foundations in English writing.
The subject is the part of the sentence that names who or what the sentence is about. It is the noun, pronoun, or noun phrase that performs the action of the verb — or, in the case of passive sentences and stative verbs, the entity being described or acted upon.
1.2.1 Simple Subject
The simple subject is the main noun or pronoun — the single word at the core of the complete subject, without its modifiers.
The dedicated teacher explained the lesson patiently. → Simple subject: teacher
She has been working here for three years. → Simple subject: She
The old, crumbling building at the end of the street was demolished. → Simple subject: building
1.2.2 Complete Subject
The complete subject is the simple subject plus all of its modifiers — every word that describes, qualifies, or adds information about the subject.
The dedicated teacher → complete subject (The + dedicated + teacher)
Every student in the final-year class → complete subject
The old, crumbling building at the end of the street → complete subject
1.2.3 Compound Subject
A compound subject consists of two or more subjects joined by a coordinating conjunction (usually and or or) that share the same verb.
Rahim and his sister both studied medicine at university.
The teacher, the principal, and the parents attended the meeting.
Either the manager or the assistant will respond to your query.
Rule: When two subjects are joined by and, the verb is plural. When joined by or or nor, the verb agrees with the subject closest to it.
Rahim and his sister are arriving tonight. (plural verb — and)
Either the manager or the assistants are available. (plural — assistants is closer)
Either the assistants or the manager is available. (singular — manager is closer)
1.2.4 Delayed Subject (There / It Constructions)
Sometimes the grammatical subject is postponed and the sentence begins with there or it — called an expletive or dummy subject. The real subject follows the verb.
There is a problem with the report. → Real subject: a problem
There were three letters on the table. → Real subject: three letters
It is important to read the instructions carefully. → Real subject: to read the instructions
It was the teacher who first noticed the error. → Real subject: the teacher
1.2.5 Understood Subject (Imperative Sentences)
In imperative sentences — commands and requests — the subject is not stated. It is understood to be you, the person being addressed.
Close the door when you leave. → Understood subject: (You) close the door.
Please submit the form before Friday. → Understood subject: (You) please submit.
Sit down and listen carefully. → Understood subject: (You) sit down.
The predicate is the part of the sentence that says something about the subject. It contains the verb and everything that follows or relates to it — the verb itself, its objects, complements, and any modifiers attached to the verb phrase.
1.3.1 Simple Predicate
The simple predicate is the main verb — or verb phrase — that expresses the core action or state.
She runs every morning. → Simple predicate: runs
The meeting has been cancelled. → Simple predicate: has been cancelled
He should have called before arriving. → Simple predicate: should have called
1.3.2 Complete Predicate
The complete predicate includes the verb plus all its associated words — the objects, complements, adverbs, and prepositional phrases that complete the meaning of the verb.
She runs five kilometres every morning before work.
The meeting has been cancelled without any explanation.
He submitted the completed report to the director before the deadline.
1.3.3 Compound Predicate
A compound predicate contains two or more verbs that share the same subject.
She arrived early and prepared everything before the guests came.
He sat down, opened his notebook, and began writing immediately.
The company reviewed the proposal, approved the budget, and notified all departments.
A compound predicate uses two or more verbs for one subject and does not need a comma before the conjunction — unlike a compound sentence, which joins two independent clauses each with its own subject.
Beyond the subject and verb, sentences often contain additional elements that complete or extend the meaning of the predicate.
1.4.1 Direct Object
The direct object is the noun or pronoun that directly receives the action of a transitive verb. It answers the question what? or whom? after the verb.
She wrote the report. → Direct object: the report (wrote what?)
He called his colleague. → Direct object: his colleague (called whom?)
They cancelled the event. → Direct object: the event
1.4.2 Indirect Object
The indirect object identifies to whom or for whom the action is done. It appears between the verb and the direct object.
She gave him the report. → Indirect object: him / Direct object: the report
He told me everything I needed to know. → IO: me / DO: everything
The teacher assigned the class a project. → IO: the class / DO: a project
Test: the indirect object can usually be replaced by a prepositional phrase with to or for. She gave the report to him. / He told everything to me.
1.4.3 Subject Complement
A subject complement follows a linking verb and describes or renames the subject. It can be a predicate adjective or a predicate nominative (noun).
She is a talented architect. → Predicate nominative: a talented architect (renames she)
The soup tastes salty. → Predicate adjective: salty (describes the soup)
He became the youngest director in the company’s history. → Predicate nominative
The situation remains unclear. → Predicate adjective
1.4.4 Object Complement
An object complement follows and describes or renames the direct object. It can be a noun or an adjective.
They elected her president. → Object complement: president (renames her)
She painted the wall white. → Object complement: white (describes the wall)
The committee appointed him chairperson. → Object complement: chairperson
He found the test difficult. → Object complement: difficult
Summary — Essential Sentence Elements
| Element | Function | Key Question | Example |
| Simple Subject | Core noun/pronoun being discussed | Who or what? | The student submitted it. |
| Complete Subject | Subject + all its modifiers | Who or what (fully)? | The dedicated student… |
| Compound Subject | Two or more subjects sharing a verb | Who AND who? | Rahim and Sara both passed. |
| Simple Predicate | The main verb or verb phrase | What happens? | She has finished. |
| Complete Predicate | Verb + all its associated words | What happens (fully)? | …submitted the report early. |
| Direct Object | Receives the action of the verb | Verb + what/whom? | She wrote the report. |
| Indirect Object | Benefits from the action | To/for whom? | She gave him the report. |
| Subject Complement | Describes/renames the subject after linking verb | What is the subject? | She is a doctor. |
| Object Complement | Describes/renames the direct object | What is the object? | They elected her president. |
A clause is a group of words that contains both a subject and a predicate. Every sentence contains at least one clause. A sentence may contain several. The critical distinction in English grammar is between independent clauses and dependent clauses — this distinction governs how sentences are structured and how they can be combined.
Difference from a phrase: A phrase does NOT contain both a subject and a predicate. A clause DOES. Running quickly (phrase — no subject, no predicate). She was running quickly (clause — she = subject, was running = predicate).
An independent clause — also called a main clause — contains a subject and a predicate and expresses a complete thought. It can stand alone as a sentence. It does not depend on any other clause to make sense.
She finished the report before the deadline. → Complete thought — can stand alone.
The meeting was cancelled without any prior notice.
He has lived in Dhaka for more than twenty years.
Every complete sentence contains at least one independent clause. A sentence can contain more than one — and when it does, the clauses are connected by coordinating conjunctions, semicolons, or both.
She finished the report, and he submitted it to the director. → Two independent clauses joined by and.
The plan was solid; the execution was the problem. → Two independent clauses joined by a semicolon.
A dependent clause — also called a subordinate clause — contains a subject and a predicate but does NOT express a complete thought. It cannot stand alone as a sentence. It depends on an independent clause to complete its meaning. Dependent clauses are introduced by subordinating conjunctions or relative pronouns.
Because she studied hard → Has a subject (she) and predicate (studied hard), but is incomplete. Because of what?
When the storm finally ended → Has subject and predicate, but leaves the reader waiting.
Which nobody had actually read → Dependent — cannot stand alone.
Dependent clauses function as specific parts of speech within the larger sentence — as adjectives, adverbs, or nouns. This is how they are classified.
2.3.1 Adjective Clause (Relative Clause)
An adjective clause modifies a noun or pronoun, functioning exactly as an adjective would — but in clause form. It is introduced by a relative pronoun (who, whom, whose, which, that) or a relative adverb (where, when, why).
The student who scored highest received the award. → who scored highest modifies the student
The report which nobody had read was finally deleted. → which nobody had read modifies the report
She met the author whose book she had read three times. → whose book she had read modifies the author
That is the town where she spent her entire childhood. → where she spent her childhood modifies the town
Defining (restrictive) clause: identifies which specific noun is meant. No commas. — The book that I lent you is quite old. Non-defining (non-restrictive) clause: adds extra information about an already-identified noun. Set off by commas. — Professor Ahmed, who has taught here for thirty years, received the award.
2.3.2 Adverb Clause
An adverb clause modifies a verb, adjective, or another adverb — functioning as an adverb in the sentence. It is introduced by a subordinating conjunction and answers questions like when, why, how, under what condition, or to what degree.
| Relationship | Subordinating Conjunctions | Example |
| Time | when, while, before, after, since, until, as soon as | She called after the meeting ended. |
| Reason / Cause | because, since, as, now that | He stayed home because he was unwell. |
| Condition | if, unless, provided that, as long as, in case | She will come if she finishes early. |
| Contrast | although, even though, though, whereas | Although it rained, they continued. |
| Purpose | so that, in order that | She set an alarm so that she wouldn’t oversleep. |
| Result | so…that, such…that | He spoke so clearly that everyone understood. |
| Comparison | as, than, as…as | She works harder than anyone else. |
| Place | where, wherever | She goes wherever the work takes her. |
| Manner | as, as if, as though | He speaks as though he knows everything. |
Rule: When the adverb clause comes BEFORE the main clause, a comma separates them. When it comes AFTER, no comma is needed.
Because she studied hard, she passed with distinction. (dependent first → comma)
She passed with distinction because she studied hard. (independent first → no comma)
2.3.3 Noun Clause
A noun clause functions exactly as a noun does within a sentence — as subject, object, subject complement, or object of a preposition. Noun clauses are introduced by that, whether, if, who, whom, whose, which, what, where, when, why, or how.
What she said surprised everyone in the room. → Noun clause as subject
Nobody knows where he went after the meeting. → Noun clause as object
The real question is whether we can trust the data. → Noun clause as subject complement
She is interested in what they are planning to do next. → Noun clause as object of preposition
I don’t understand why the decision was reversed. → Noun clause as object
That-clauses are the most common noun clauses: She believes that honesty is essential. / It is important that every member attend. (subjunctive mood)
A phrase is a group of related words that functions as a single grammatical unit within a sentence. Unlike a clause, a phrase does NOT contain both a subject and a predicate. It cannot stand alone as a sentence. Phrases function as nouns, adjectives, or adverbs, and they are classified according to the key word — or head word — around which they are built.
3.2.1 Noun Phrase
A noun phrase consists of a noun and all its modifiers — articles, adjectives, prepositional phrases, participial phrases — functioning together as a single noun.
The dedicated teacher from our school → noun phrase acting as subject
A long, handwritten letter → noun phrase acting as direct object
Every student in the final-year class → noun phrase
3.2.2 Verb Phrase
A verb phrase consists of a main verb plus its auxiliary verbs, forming the complete predicate verb of the sentence.
She has been working on this project for six months. → has been working
He should have called before arriving. → should have called
The report will be submitted tomorrow. → will be submitted
3.2.3 Adjective Phrase
An adjective phrase is a group of words built around an adjective that modifies a noun or pronoun. It may include intensifiers, qualifiers, or complements of the adjective.
She wore a dress incredibly long for the occasion.
He was proud of his achievement. → proud of his achievement modifies he
The room was full of antique furniture.
3.2.4 Adverb Phrase
An adverb phrase functions as an adverb — modifying a verb, adjective, or another adverb.
She completed the task with remarkable speed. → modifies completed
He spoke in a very quiet voice. → modifies spoke
She arrived incredibly late. → modifies arrived
3.2.5 Prepositional Phrase
A prepositional phrase begins with a preposition and ends with its object (a noun, pronoun, or gerund). It functions as either an adjective or an adverb.
The book on the shelf belongs to her. → on the shelf modifies book (adjective)
She worked throughout the night. → throughout the night modifies worked (adverb)
He arrived before the meeting. → before the meeting modifies arrived (adverb)
3.2.6 Participial Phrase
A participial phrase begins with a present participle (-ing form) or past participle (-ed / irregular form) and modifies a noun. It always functions as an adjective.
Running at full speed, she crossed the finish line first. → modifies she
Exhausted by the long journey, he went straight to bed. → modifies he
The student sitting at the back raised her hand. → modifies student
Critical rule: A participial phrase must be placed as close as possible to the noun it modifies. Placing it incorrectly creates a dangling modifier. Dangling: Running through the park, the trees looked beautiful. (Trees were not running.) Correct: Running through the park, she noticed the trees looked beautiful.
3.2.7 Gerund Phrase
A gerund phrase begins with a gerund (a verb form ending in -ing used as a noun) and includes its objects and modifiers. The entire phrase functions as a noun.
Swimming five kilometres every morning is her daily routine. → subject
She enjoys reading classic novels late at night. → direct object
He succeeded in finishing the project on time. → object of preposition
3.2.8 Infinitive Phrase
An infinitive phrase begins with to + base verb and includes its objects and modifiers. It can function as a noun, adjective, or adverb.
To travel abroad requires careful planning. → noun phrase (subject)
She has a strong desire to succeed in her career. → adjective phrase (modifies desire)
He studies hard to achieve the best possible results. → adverb phrase (purpose)
She woke up early to finish the presentation before dawn. → adverb phrase (purpose)
3.2.9 Appositive Phrase
An appositive phrase is a noun phrase placed beside another noun to identify, rename, or give additional information about it.
My sister, a qualified doctor, arrived from London last week. → a qualified doctor renames sister
Dhaka, the capital of Bangladesh, is one of the most densely populated cities in the world.
His greatest fear, failure in front of his peers, kept him up at night.
| Phrase Type | Head Word | Grammatical Function | Example |
| Noun Phrase | Noun | Subject, object, complement | The dedicated teacher from our school |
| Verb Phrase | Main verb + auxiliaries | Predicate of the sentence | has been working / should have called |
| Adjective Phrase | Adjective | Modifies a noun or pronoun | proud of his achievement |
| Adverb Phrase | Adverb or preposition | Modifies verb, adjective, adverb | with remarkable speed |
| Prepositional Phrase | Preposition | Adjective or adverb function | on the shelf / throughout the night |
| Participial Phrase | Participle (-ing or -ed) | Adjective — modifies noun | Running at full speed… |
| Gerund Phrase | Gerund (-ing as noun) | Noun function | Swimming five kilometres daily |
| Infinitive Phrase | Infinitive (to + verb) | Noun, adjective, or adverb | to achieve the best results |
| Appositive Phrase | Noun | Renames another noun | My sister, a qualified doctor… |
English sentences are classified by structure according to the number and type of clauses they contain. There are four structural types: simple, compound, complex, and compound-complex. Each serves different communicative purposes, and skilled writers use all four in combination to create varied, sophisticated prose.
A simple sentence contains exactly one independent clause and no dependent clauses. Despite its name, a simple sentence is not necessarily short or unsophisticated. It can contain multiple phrases, a compound subject, or a compound predicate — as long as it has only one independent clause.
She runs. → Subject + verb. The most minimal sentence.
The dedicated teacher from the neighbouring school explained the entire concept clearly and patiently.
Rahim and his sister both studied medicine at the same university. → Compound subject, one clause.
She arrived early, prepared all the materials, and waited for the others to arrive. → Compound predicate, one clause.
A simple sentence can be long and detailed — it only needs to contain one independent clause. Do not confuse simple structure with simple meaning.
A compound sentence contains two or more independent clauses and no dependent clauses. The independent clauses are joined by a coordinating conjunction (for, and, nor, but, or, yet, so), a semicolon, or a conjunctive adverb followed by a semicolon.
Joined by coordinating conjunction (with comma):
She studied hard, and she passed every single exam.
He tried his best, but the result still disappointed him.
You can stay here, or you can leave now — the choice is yours.
Joined by semicolon alone:
The plan was well designed; the execution was flawed.
She arrived on time; nobody else did.
Joined by conjunctive adverb (semicolon + adverb + comma):
He missed the meeting; therefore, he was not briefed on the changes.
The data was incomplete; furthermore, it had not been verified.
Rule: A comma alone between two independent clauses creates a comma splice — one of the most common errors in written English. She studied hard, she passed. → Incorrect. She studied hard, and she passed. / She studied hard; she passed. → Correct.
A complex sentence contains one independent clause and one or more dependent clauses. The dependent clause is introduced by a subordinating conjunction or a relative pronoun, and it is subordinated to — dependent on — the main clause.
Dependent clause before independent clause (comma required):
Because she studied tirelessly, she passed every exam with distinction.
Although it was raining heavily, they continued the outdoor ceremony.
When the results were finally announced, the entire class fell silent.
Dependent clause after independent clause (no comma needed):
She passed every exam with distinction because she studied tirelessly.
He stayed home that evening because he was feeling unwell.
She smiled warmly at the students who had worked so hard.
Relative clause embedded in the middle:
The student who scored highest in the entire cohort received the scholarship.
The report, which nobody had actually read, was deleted from the system.
Complex sentences allow writers to show logical relationships between ideas — cause and effect, contrast, condition, concession. They are essential to sophisticated writing.
A compound-complex sentence contains two or more independent clauses AND one or more dependent clauses. It is the most structurally elaborate of the four types, combining the joining of equal ideas (compound) with the subordination of less important ones (complex).
She studied hard because she wanted to succeed, and her dedication was evident to everyone who worked with her.
Breaking it down: She studied hard (independent) / because she wanted to succeed (dependent — adverb clause) / and her dedication was evident (independent) / to everyone who worked with her (dependent — relative clause).
Although the project was delayed, she completed all the research on time, and the final report exceeded everyone’s expectations.
He had always believed that hard work would be rewarded, but when the results were announced, his name was not on the list.
| Type | Independent Clauses | Dependent Clauses | Example |
| Simple | 1 | 0 | She finished the report before the deadline. |
| Compound | 2 or more | 0 | She studied hard, and she passed every exam. |
| Complex | 1 | 1 or more | She passed because she studied hard. |
| Compound-Complex | 2 or more | 1 or more | Although it was difficult, she persisted, and she succeeded. |
Sentences are also classified according to their communicative purpose — what the speaker or writer is trying to accomplish with the sentence. There are four types: declarative, interrogative, imperative, and exclamatory.
A declarative sentence makes a statement — it declares, reports, or describes a fact, opinion, or situation. It is the most common type of sentence in English. It always ends with a full stop (period).
She lives in Dhaka and has worked there for over ten years.
The meeting was postponed until further notice.
English is the most widely studied second language in the world.
He had not realised how much time had passed.
Declarative sentences can be affirmative (positive) or negative. They constitute the bulk of any written text — essays, reports, stories, articles, and arguments are built primarily from declarative sentences.
An interrogative sentence asks a question. It always ends with a question mark. Interrogative sentences are divided into several types based on the kind of answer expected.
5.3.1 Yes/No Question
Expects a yes or no answer. Formed by inverting the subject and auxiliary verb.
Did she submit the report on time?
Is the meeting still scheduled for this afternoon?
Have you read the updated guidelines?
5.3.2 WH-Question (Open Question)
Expects specific information — not yes or no. Begins with a WH-word: what, where, when, why, who, whom, whose, which, how.
What time does the train leave from this platform?
Who is responsible for this section of the report?
How did she manage to finish so quickly?
5.3.3 Tag Question
A tag question is a short question added to the end of a declarative sentence to confirm information or seek agreement. If the main clause is positive, the tag is negative. If the main clause is negative, the tag is positive.
She finished the report on time, didn’t she? → Positive statement + negative tag
He hasn’t called yet, has he? → Negative statement + positive tag
You’ve been to Dhaka before, haven’t you?
They won’t mind waiting a little longer, will they?
5.3.4 Alternative Question
Offers two or more specific options and expects the listener to choose one.
Would you prefer coffee or tea?
Should we meet on Monday or leave it until Wednesday?
Is this a problem of resources, time, or planning?
5.3.5 Indirect Question (Embedded Question)
An interrogative clause embedded inside a larger statement or polite request. The word order reverts to normal — no inversion.
Direct: Where is the office? → Indirect: Could you tell me where the office is?
Direct: When does the bus leave? → Indirect: Do you know when the bus leaves?
Direct: Why did she resign? → Indirect: I have no idea why she resigned.
Rule: In indirect questions, the subject comes before the verb — normal statement order. Never invert after the WH-word in an embedded question.
An imperative sentence gives a command, makes a request, offers an instruction, or extends an invitation. The subject (you) is almost always omitted because it is understood. Imperative sentences end with a full stop or, for strong commands, an exclamation mark.
Commands:
Close the door when you leave the room.
Submit the completed form before the end of the working day.
Do not enter the restricted area without proper authorisation.
Requests (softened with please):
Please read the instructions carefully before you begin.
Could you please send me the updated version of the file?
Instructions (numbered steps):
Open the document and scroll to the final section.
Check all the details before clicking the submit button.
Invitations and suggestions:
Come and join us for dinner this evening.
Take a seat — we will be with you in just a moment.
Let’s (let us) is used for inclusive commands or suggestions where the speaker includes themselves: Let’s begin the meeting. / Let’s not waste any more time. This is different from a standard imperative because the subject includes we, not just you.
An exclamatory sentence expresses a strong emotion — surprise, excitement, anger, admiration, or disbelief. It ends with an exclamation mark. In formal writing, exclamatory sentences are used sparingly; in conversation and creative writing, they appear more frequently.
Formed with what:
What an extraordinary performance she gave last night!
What a mess they have made of the entire situation!
What brilliant work this is!
Formed with how:
How quickly time passes when you are absorbed in a task!
How courageous she was throughout the entire ordeal!
Emphatic statements:
She is absolutely brilliant!
I had no idea it would turn out this way!
That was the most remarkable thing I have ever witnessed!
| Type | Purpose | Punctuation | Example |
| Declarative | States a fact, opinion, or situation | Full stop (.) | She lives in Dhaka. |
| Interrogative | Asks a question | Question mark (?) | Does she live in Dhaka? |
| Imperative | Gives command, request, or instruction | Full stop or ! | Come inside immediately. |
| Exclamatory | Expresses strong emotion | Exclamation mark (!) | What a wonderful surprise this is! |
Every English sentence follows one of a small number of underlying structural patterns. These patterns are determined by the type of verb used and the elements that must accompany it. Knowing these patterns helps writers construct sentences correctly and understand why certain elements are required or optional.
| Pattern | Structure | Example |
| S + V | Subject + Intransitive Verb | She slept. / Birds sing. / He arrived. |
| S + V + O | Subject + Transitive Verb + Direct Object | She wrote the report. / He kicked the ball. |
| S + V + IO + DO | Subject + Verb + Indirect Object + Direct Object | She gave him the report. |
| S + LV + SC | Subject + Linking Verb + Subject Complement | She is a doctor. / The soup tastes salty. |
| S + V + O + OC | Subject + Verb + Direct Object + Object Complement | They elected her president. |
| S + V + A | Subject + Verb + Adverbial | She lives in Dhaka. / He works here. |
| There + V + S | Existential / Delayed Subject | There is a problem. / There were three letters. |
Pattern 1 — S + V (Subject + Intransitive Verb)
The simplest pattern. The verb is intransitive — it needs no object. The action is complete in itself.
She slept. / Birds sing. / He arrived. / The engine stalled. / She laughed.
Pattern 2 — S + V + O (Subject + Transitive Verb + Direct Object)
The most common pattern. A transitive verb must be followed by a direct object — the noun that receives the action.
She wrote the report. / He kicked the ball. / They cancelled the event.
Pattern 3 — S + V + IO + DO (Subject + Verb + Indirect Object + Direct Object)
The verb takes both an indirect and a direct object. The indirect object (usually a person) benefits from the action. It sits between the verb and the direct object.
She gave him the report. → him = IO / the report = DO
He told me everything. → me = IO / everything = DO
They sent her an invitation. → her = IO / an invitation = DO
Pattern 4 — S + LV + SC (Subject + Linking Verb + Subject Complement)
A linking verb connects the subject to a complement that describes or renames it.
She is a doctor. (predicate nominative — renames she)
The soup tastes salty. (predicate adjective — describes the soup)
He became the youngest director in the firm.
Pattern 5 — S + V + O + OC (Subject + Verb + Direct Object + Object Complement)
A complement that describes or renames the direct object, not the subject.
They elected her president. → president renames her
She painted the wall white. → white describes the wall
Pattern 6 — S + V + A (Subject + Verb + Adverbial)
Some verbs require an adverbial of place or manner to complete their meaning.
She lives in Dhaka. → in Dhaka is required — She lives. is incomplete.
He put the files on the table. → on the table is required.
Pattern 7 — There / It + V + S (Existential Construction)
Used to introduce new information. The real subject follows the verb.
There is a problem with the current approach. → a problem is the real subject
It was the combination of factors that caused the delay.
A passage built entirely from simple sentences feels choppy and childish. A passage built entirely from compound-complex sentences feels laboured and exhausting. Skilled writers vary sentence length and structure deliberately — to control pace, emphasis, and rhythm.
7.1.1 Short Sentences — Impact and Clarity
Short, simple sentences create emphasis. They slow the reader down. They make a single point land with full weight. Used after a series of longer sentences, a short sentence becomes a powerful tool for emphasis.
She had worked on the project for three months, through late nights and difficult revisions, through setbacks and disagreements. She finished it. That was enough.
7.1.2 Long Sentences — Complexity and Flow
Longer sentences allow writers to show relationships between ideas — to qualify, contrast, explain, and extend. They create momentum and allow complex thought to unfold in a single, integrated structure.
Although she had doubted herself at every stage of the process, questioning her judgment and second-guessing her conclusions, the finished report demonstrated a clarity and rigour that her colleagues had rarely seen.
7.1.3 Sentence Variety in Practice
The goal is not to use all four structural types in every paragraph — it is to avoid monotony. A mix of short declaratives for impact, longer complex sentences for explanation, and the occasional compound sentence to join related ideas produces prose that feels both natural and controlled.
The voice of a sentence determines whether the subject performs the action (active) or receives it (passive).
Active Voice — Subject performs the action
She wrote the report. → Subject (she) → verb (wrote) → object (report)
The committee approved the proposal unanimously.
He discovered the error during the final review.
Passive Voice — Subject receives the action
The report was written by her. → Subject (report) receives the action
The proposal was approved unanimously by the committee.
The error was discovered during the final review.
Passive voice is formed with: be (in appropriate tense) + past participle.
| Tense | Active | Passive |
| Simple Present | She writes the report. | The report is written by her. |
| Simple Past | She wrote the report. | The report was written by her. |
| Present Perfect | She has written the report. | The report has been written by her. |
| Simple Future | She will write the report. | The report will be written by her. |
| Present Continuous | She is writing the report. | The report is being written by her. |
| Past Continuous | She was writing the report. | The report was being written by her. |
| Modal | She should write the report. | The report should be written by her. |
Use active voice as the default — it is clearer, more direct, and more vigorous. Use passive voice when: the agent (doer) is unknown or unimportant; the action or its recipient is more important than the doer; the agent has already been identified; or a formal or impersonal tone is required (common in academic and scientific writing).
The samples were collected over a three-month period. (agent unknown/unimportant — passive is appropriate)
Mistakes were made. (famously evasive — passive conceals the agent deliberately)
Direct speech reproduces the exact words of a speaker, enclosed in quotation marks. Indirect speech (reported speech) reports what was said without quotation marks, usually changing pronouns, tenses, and time expressions.
Direct Speech:
She said, “I will submit the report tomorrow.”
“The meeting has been cancelled,” he announced quietly.
He asked her, “Have you read the latest guidelines?”
Indirect Speech — the tense shift (backshift):
She said that she would submit the report the following day.
He announced that the meeting had been cancelled.
He asked her whether she had read the latest guidelines.
| Direct Speech Tense | Indirect Speech Tense (backshift) |
| Simple present (is, writes) | Simple past (was, wrote) |
| Present continuous (is writing) | Past continuous (was writing) |
| Present perfect (has written) | Past perfect (had written) |
| Simple past (wrote) | Past perfect (had written) |
| will | would |
| can | could |
| may | might |
| must | had to |
Changes in other elements:
| Direct Speech | Indirect Speech |
| today | that day |
| yesterday | the day before / the previous day |
| tomorrow | the following day / the next day |
| here | there |
| now | then |
| this / these | that / those |
| I / we | she / he / they (as appropriate) |
| my / our | her / his / their (as appropriate) |
A fragment is an incomplete sentence — a group of words that lacks a subject, lacks a predicate, or fails to express a complete thought. Fragments often appear when a dependent clause or a phrase is written as if it were a complete sentence.
Fragment: Because she worked so hard. → What happened because she worked hard? No main clause.
Correct: Because she worked so hard, she passed every exam with distinction.
Fragment: The student sitting at the back of the classroom. → No predicate — what did the student do?
Correct: The student sitting at the back of the classroom raised her hand.
Fragment: Running through the park and listening to music. → No subject, no complete predicate.
Correct: She was running through the park and listening to music.
A comma splice occurs when two independent clauses are joined with only a comma — no conjunction or semicolon. This is one of the most frequent errors in written English.
Splice: She studied hard, she passed every exam.
Correct (1): She studied hard, and she passed every exam. (add coordinating conjunction)
Correct (2): She studied hard; she passed every exam. (use semicolon)
Correct (3): Because she studied hard, she passed every exam. (subordinate one clause)
Splice: The report was incomplete, the figures had not been verified.
Correct: The report was incomplete; furthermore, the figures had not been verified.
A run-on sentence is similar to a comma splice but worse — two independent clauses are joined with nothing at all. Not even a comma separates them.
Run-on: She studied hard she passed every exam.
Correct: She studied hard, and she passed every exam.
Run-on: He was exhausted he kept working through the night.
Correct: He was exhausted, but he kept working through the night.
A dangling modifier is a word or phrase that modifies a word not clearly stated in the sentence — or that logically connects to the wrong element. This produces unintentionally absurd or misleading sentences.
Dangling: Running through the park, the trees looked beautiful. (The trees were not running.)
Correct: Running through the park, she thought the trees looked beautiful.
Dangling: Exhausted after the long journey, the hotel room was a welcome sight. (The room was not exhausted.)
Correct: Exhausted after the long journey, she was grateful to reach the hotel room.
Dangling: Having finished the exam, the clock showed 3 PM. (The clock did not finish the exam.)
Correct: Having finished the exam, she noticed the clock showed 3 PM.
A misplaced modifier is a word, phrase, or clause placed too far from the word it is supposed to modify — causing confusion or unintended meaning.
Misplaced: She almost drove her children to school every day. (She almost drove = she nearly drove but didn’t?)
Correct: She drove her children to school almost every day.
Misplaced: He served sandwiches to the guests on paper plates. (Guests on paper plates?)
Correct: He served sandwiches on paper plates to the guests.
Misplaced: She only told him the truth. (She only told — did nothing else?)
Correct (likely): She told only him the truth. (She told no one else.)
Parallelism requires that words, phrases, or clauses joined in a series or paired construction use the same grammatical form. When the forms are inconsistent, the sentence feels awkward and unbalanced.
Faulty: She enjoys swimming, to read, and long walks. (mixing gerund, infinitive, noun)
Correct: She enjoys swimming, reading, and taking long walks. (all gerunds)
Faulty: He is intelligent, hardworking, and has a lot of patience. (adj, adj, clause)
Correct: He is intelligent, hardworking, and patient. (all adjectives)
Faulty: The report was thorough, clearly written, and it covered all the key points.
Correct: The report was thorough, clearly written, and comprehensive.
The verb must agree with its subject in number — singular subject takes singular verb, plural subject takes plural verb. Several situations cause agreement errors.
Intervening phrase between subject and verb:
Error: The box of documents were left on the table. (Box is the subject, not documents.)
Correct: The box of documents was left on the table.
Collective nouns:
The team is playing well this season. (treating as a unit — American English)
The team are playing well this season. (treating as individuals — British English)
Indefinite pronouns:
Everyone has submitted their work. (everyone = singular verb)
Neither of the answers is acceptable. (neither = singular)
Compound subjects:
Rahim and his sister are arriving tomorrow. (and = plural)
Either the manager or the assistants are available. (verb agrees with nearest subject)
A pronoun must agree with its antecedent in number, gender, and person.
Error: Each student must submit their assignments. (Each is singular — but their is now widely accepted for singular they)
Traditional: Each student must submit his or her assignment.
Modern accepted: Each student must submit their assignment.
Error: The company updated their website. (company is singular — use its)
Correct: The company updated its website.
Singular they — using they/them/their to refer to a singular antecedent of unknown or unspecified gender — is now widely accepted in modern English usage and endorsed by most major style guides.
| Error | What It Is | Wrong | Correct |
| Fragment | Incomplete sentence — missing subject, verb, or complete thought | Because she worked hard. | Because she worked hard, she passed. |
| Comma Splice | Two independent clauses joined with only a comma | She studied, she passed. | She studied, and she passed. |
| Run-On | Two independent clauses with no separator at all | She studied she passed. | She studied; she passed. |
| Dangling Modifier | Modifier logically connects to wrong or absent word | Running outside, the rain was heavy. | Running outside, she found the rain was heavy. |
| Misplaced Modifier | Modifier placed too far from the word it modifies | She almost drove there every day. | She drove there almost every day. |
| Faulty Parallelism | Elements in a series use inconsistent grammatical forms | She likes reading, to swim, walks. | She likes reading, swimming, and walking. |
| S-V Agreement | Verb does not agree in number with its subject | The box of files were on the table. | The box of files was on the table. |
| Pronoun Agreement | Pronoun does not agree with its antecedent | The company updated their website. | The company updated its website. |
The sentence is the unit where grammar becomes language. Parts of speech are the raw material — but it is the sentence that shapes them into meaning. Understanding sentence structure is not an academic exercise: it is the practical knowledge that allows a writer to say exactly what they mean, and nothing more or less than what they mean.
Every sentence a person writes either serves its purpose or falls short of it. Fragments leave thoughts unfinished. Run-ons blur the lines between ideas. Dangling modifiers distort meaning. Comma splices signal carelessness. Faulty parallelism makes strong ideas feel weak. These are not minor stylistic concerns — they are failures of communication.
But the opposite is equally true. A well-constructed sentence — precise in its structure, clear in its logic, appropriate in its length — is one of the most powerful tools available to any writer. It requires no special talent. It requires knowledge, practice, and the willingness to look closely at what has been written and ask: is this exactly what I meant to say?
This chapter covers: Definition · Subject & Predicate · Objects & Complements · Clauses (Independent, Dependent, Adjective, Adverb, Noun) · Phrases (9 types) · Structure Types (Simple, Compound, Complex, Compound-Complex) · Purpose Types (Declarative, Interrogative, Imperative, Exclamatory) · Sentence Patterns · Voice · Reported Speech · 8 Common Errors
| Category | Type / Element | Definition | Example |
| Structure | Simple | 1 independent clause, 0 dependent | She finished the report. |
| Structure | Compound | 2+ independent, 0 dependent | She studied hard, and she passed. |
| Structure | Complex | 1 independent, 1+ dependent | She passed because she studied. |
| Structure | Compound-Complex | 2+ independent, 1+ dependent | Although it was difficult, she persisted, and she won. |
| Purpose | Declarative | Makes a statement | She lives in Dhaka. |
| Purpose | Interrogative | Asks a question | Does she live in Dhaka? |
| Purpose | Imperative | Gives a command or request | Come inside immediately. |
| Purpose | Exclamatory | Expresses strong emotion | What a wonderful surprise! |
| Clause | Independent | Complete thought — stands alone | She finished the report. |
| Clause | Dependent (Adverb) | Modifies verb — introduced by subord. conj. | because she studied hard |
| Clause | Dependent (Adjective) | Modifies noun — introduced by relative pronoun | who scored highest |
| Clause | Dependent (Noun) | Functions as noun | what she said / that he would come |
| Phrase | Noun Phrase | Noun + modifiers | the dedicated teacher from our school |
| Phrase | Prepositional Phrase | Preposition + object | on the shelf / before the meeting |
| Phrase | Participial Phrase | Participle + modifiers — adjective function | running at full speed |
| Phrase | Gerund Phrase | Gerund + modifiers — noun function | swimming five kilometres daily |
| Phrase | Infinitive Phrase | to + verb — noun/adj/adverb function | to achieve the best results |
| Error | Fragment | Incomplete sentence | Because she worked hard. (no main clause) |
| Error | Comma Splice | Two clauses joined by comma only | She studied, she passed. |
| Error | Run-On | Two clauses with no separator | She studied she passed. |
| Error | Dangling Modifier | Modifier connects to wrong/absent noun | Running outside, the rain was heavy. |
| Error | Faulty Parallelism | Inconsistent grammatical forms in series | She likes reading, to swim, walks. |
