Clause

Learn everything about clauses in English grammar. This comprehensive chapter covers independent and dependent clauses, noun clauses, adjective clauses, adverb clauses, sentence types, and common errors with practice exercises.

Chapter Overview

The clause is the central building block of English sentences. Every sentence you write is made of at least one clause, and most complex sentences contain several. Understanding how clauses work — what they consist of, how they connect, and what role each plays — is the key to writing well-structured, varied, and grammatically correct prose.

By the end of this chapter, you will be able to:

  • Define a clause and distinguish it from a phrase
  • Identify the essential components of a clause: subject and predicate
  • Distinguish between independent (main) clauses and dependent (subordinate) clauses
  • Recognize and use the three types of dependent clause: noun clauses, adjective clauses, and adverb clauses
  • Identify relative clauses, including restrictive and non-restrictive types
  • Understand how clauses combine to form simple, compound, complex, and compound-complex sentences
  • Use subordinating conjunctions, coordinating conjunctions, and relative pronouns correctly
  • Recognize and correct the most common clause-related errors: fragments, run-ons, and comma splices

1.1 What Is a Clause?

A clause is a group of words that contains both a subject and a finite verb (a verb that is tensed — that is, a verb which shows a specific tense, such as past or present). The clause is the smallest grammatical unit that can express a complete thought or form part of a larger sentence.

The term clause often causes confusion because it sounds similar to sentence, and indeed every simple sentence is a clause. But not every clause is a sentence. Some clauses can stand alone as complete sentences; others can only exist as parts of a larger structure. This distinction — between clauses that are grammatically independent and clauses that depend on the rest of the sentence to make sense — is one of the most important in English grammar.

CORE CONCEPT

A clause has two essential parts:

  • Subject — the noun or pronoun that the clause is about
  • Predicate — the verb (and whatever accompanies it) that says something about the subject

Both parts must be present for a group of words to qualify as a clause.

Examples of clauses:

  • The storm intensified. (subject: the storm; predicate: intensified)
  • She had already submitted the application. (subject: she; predicate: had already submitted the application)
  • Although the committee disagreed… (subject: the committee; predicate: disagreed — but incomplete: needs a main clause)

1.1.1 Clause vs. Phrase

A clause contains a subject and a finite verb. A phrase does not. A phrase is a group of related words that functions as a single unit — as a noun, verb, adjective, or adverb — but lacks the subject-verb combination that defines a clause.

Group of Words Clause or Phrase? Reason
after the meeting ended Clause (dependent) Has subject (the meeting) and finite verb (ended).
after the long and exhausting meeting Phrase (prepositional) No finite verb; after introduces a noun phrase only.
running along the coastal path Phrase (participial) Running is a participle, not a finite verb; no subject.
she was running along the coastal path Clause (independent) Has subject (she) and finite verb (was running).
the committee’s final recommendation Phrase (noun phrase) No verb of any kind.
the committee finally made its recommendation Clause (independent) Has subject (the committee) and finite verb (made).

1.1.2 Finite vs. Non-Finite Verbs

Clauses require finite verbs — verbs that carry tense and agree with their subjects. Non-finite verb forms (infinitives, gerunds, and participles) do not make a clause on their own; they form phrases.

Verb Form Type Creates a Clause? Example
arrived Finite (simple past) Yes The delegation arrived on time.
is reviewing Finite (present continuous) Yes The panel is reviewing the data.
to review Non-finite (infinitive) No to review the data (phrase only)
reviewing Non-finite (gerund/participle) No reviewing the data (phrase only)
reviewed Non-finite (past participle) No reviewed by the panel (phrase only)
had been revised Finite (past perfect passive) Yes The document had been revised.

1.2 Independent Clauses (Main Clauses)

1.2.1 Definition

An independent clause — also called a main clause — is a clause that expresses a complete thought and can stand alone as a grammatically correct sentence. It does not depend on any other clause to make sense. Every grammatically correct sentence must contain at least one independent clause.

  • The auditors completed their review in three weeks. (Complete thought. Can stand alone.)
  • The evidence was compelling. (Short but complete. Independent clause.)
  • She drafted the proposal, and her colleague revised it overnight. (Two independent clauses joined by and. Each could stand alone.)

1.2.2 The Structure of an Independent Clause

An independent clause can be very short or very long, but it always contains at minimum a subject and a predicate. The predicate itself must include a finite verb and may also include objects, complements, and adverbials.

Subject Predicate (Verb + Rest) Notes
Rain fell. Minimum clause: intransitive verb only.
The inspector found three violations. Transitive verb + direct object.
The committee awarded her the prize. Verb + indirect object + direct object.
The new system has been running smoothly since March. Passive verb phrase + adverbial.
Every delegate signed the declaration before midnight. Subject + verb + object + adverbial.
The conference centre was fully booked for the entire month of October. Linking verb + subject complement + adverbial.

1.2.3 Joining Independent Clauses

Two or more independent clauses can be joined within a single sentence in three ways. Each method uses a different punctuation pattern and a different connecting word (or none at all).

Method 1 — Coordinating Conjunction (FANBOYS)

The seven coordinating conjunctions — for, and, nor, but, or, yet, so — join independent clauses of equal grammatical weight. A comma precedes the conjunction when both clauses are complete.

  • The survey was conducted in October, and the results were published in December.
  • The project was ambitious, but the team delivered on time.
  • She could accept the offer, or she could negotiate better terms.
  • The proposal was well written, yet the committee rejected it.
REFERENCE: FANBOYS — the seven coordinating conjunctions:
For   And   Nor   But   Or   Yet   So

Each joins clauses of equal rank. Note: a comma is required before the conjunction when both clauses are grammatically independent and substantial. For very short clauses, the comma may be omitted.

Method 2 — Semicolon

A semicolon alone (with no conjunction) joins two independent clauses whose ideas are closely related. The clauses must be of roughly equal weight, and the relationship between them must be clear without a connecting word.

  • The laboratory results were inconclusive; a second round of testing was ordered.
  • She revised the document four times; the final version was approved without objection.

A semicolon may also be used with a conjunctive adverb (however, therefore, consequently, moreover, nevertheless, nonetheless, furthermore, meanwhile, instead, in contrast). A comma follows the conjunctive adverb.

  • The initial estimate was far too low; however, the revised figure was accepted.
  • The evidence was circumstantial; therefore, the panel requested further documentation.

Method 3 — Colon

A colon may join two independent clauses when the second clause explains, elaborates, or illustrates the first. The colon signals: what follows answers or expands upon what came before.

  • The board faced a difficult choice: it could merge with a competitor or risk insolvency.
  • The recommendation was straightforward: all parties should return to the negotiating table.

1.3 Dependent Clauses (Subordinate Clauses)

1.3.1 Definition

A dependent clause — also called a subordinate clause — is a clause that contains a subject and a finite verb but cannot stand alone as a complete sentence. It depends on an independent clause to complete its meaning. Dependent clauses are introduced by subordinating words: subordinating conjunctions, relative pronouns, or other connectors that signal the clause’s relationship to the main clause.

  • Dependent clause alone: Although the results were promising… (Incomplete. Reader expects more.)
  • With independent clause: Although the results were promising, the study was never published. (Now complete.)

1.3.2 Three Types of Dependent Clause

Dependent clauses are classified by the function they perform within the sentence.

Type Function in Sentence Introduced By Example
Noun clause Subject, object, or complement that, whether, if, who, what, why, etc. What she discovered changed everything.
Adjective clause (Relative) Modifies a noun or pronoun who, whom, whose, which, that The report that she submitted was exceptional.
Adverb clause Modifies a verb, adjective, or adverb because, although, when, if, unless, etc. Because the deadline was extended, the team revised the document.

1.4 Noun Clauses

1.4.1 Definition

A noun clause is a dependent clause that performs the same grammatical functions as a noun. It can be the subject of a verb, the object of a verb, the object of a preposition, a subject complement (predicate nominative), or an appositive.

1.4.2 Functions of Noun Clauses

As Subject of the Main Verb

  • [What the investigation uncovered] shocked the entire department.
  • [Whether the board will approve the budget] remains uncertain.

As Object of the Main Verb

  • The committee announced [that the decision had been postponed.]
  • She explained [why the methodology had been changed.]

As Subject Complement

  • The real question is [whether the evidence is admissible.]
  • The truth is [that the project ran over budget from the beginning.]

As Object of a Preposition

  • The report focused on [what the auditors had missed in previous reviews.]
  • There was disagreement about [whether the findings should be made public.]

As Appositive

  • The suggestion [that all meetings be recorded] was accepted without debate.
  • His claim [that he had never received the notification] was disputed.

1.4.3 The Introductory Word That

The subordinating conjunction that frequently introduces noun clauses functioning as objects. In informal English, it is often omitted. In formal writing, retaining it improves clarity.

STYLE TIP: Retain that when:
  • The noun clause is the subject.
  • Other elements intervene between the verb and the clause.
  • The clause is long or structurally complex.

1.5 Adjective Clauses (Relative Clauses)

1.5.1 Definition

An adjective clause — more commonly called a relative clause — is a dependent clause that modifies a noun or pronoun. It answers the questions which one? or what kind of?

1.5.2 Relative Pronouns

Relative Pronoun Refers To Grammatical Role Example
who People Subject The witness who testified was credible.
whom People Object The solicitor whom we hired was recommended.
whose People/Things Possessive The researcher whose findings were challenged…
which Things/Ideas Subject/Object The amendment, which was passed, took effect.
that People/Things Restrictive only The proposal that she submitted was approved.

1.5.3 Restrictive vs. Non-Restrictive Relative Clauses

Restrictive Relative Clauses: Provides essential information to identifying the noun. No commas used.

  • The report that was submitted last Tuesday contained an error.

Non-Restrictive Relative Clauses: Provides additional detail about an already identified noun. Commas must be used.

  • The final report, which was submitted last Tuesday, contained an error.
CRITICAL RULE

COMMA RULE: Non-restrictive relative clauses are always set off by commas. Restrictive relative clauses never are.

THAT vs. WHICH:
Use that for restrictive clauses (no commas): The system that failed has been replaced.
Use which for non-restrictive clauses (with commas): The system, which had been installed last year, failed.

1.5.4 Relative Adverbs — Where, When, Why

Relative Adverb Modifies Example
where Place The village where she grew up…
when Time There will come a day when this is standard.
why Reason Nobody explained the reason why it was rejected.

1.6 Adverb Clauses

1.6.1 Definition

An adverb clause is a dependent clause that modifies a verb, an adjective, or another adverb. Adverb clauses answer questions such as when? where? why? how? under what condition?

1.6.2 Types of Adverb Clauses by Meaning

Type Subordinating Conjunctions Example
Time when, while, after, before, since… Once the contract was signed, work began.
Reason because, since, as, given that… Since the evidence was inconclusive, the case was adjourned.
Condition if, unless, provided that… The project will proceed provided that funding is secured.
Concession although, though, even though… Although the panel disagreed, the motion was passed.
Purpose so that, in order that… She saved every draft so that she could track revisions.

1.6.3 Punctuation of Adverb Clauses

PUNCTUATION RULE

RULE 1 — Adverb clause FIRST: Use a comma after the adverb clause.
Because the funding had been withdrawn, the project was put on hold.

RULE 2 — Adverb clause LAST: No comma is usually needed.
The project was put on hold because the funding had been withdrawn.

1.6.4 Reduced Adverb Clauses

When the subject is the same as the main clause, the adverb clause can be reduced to a participial phrase.

  • Full: After she had reviewed all the files, she prepared her report.
  • Reduced: After reviewing all the files, she prepared her report.
COMMON ERROR: Dangling Modifiers

Dangling: After reviewing all the files, the summary report was prepared. (The report didn’t review the files.)

Correct: After reviewing all the files, she prepared the summary report.

1.7 Sentence Types Based on Clause Structure

Sentence Type Clause Structure Formula Example
Simple One independent clause only 1 Ind. The committee reached a unanimous verdict.
Compound Two or more independent clauses 2+ Ind. The committee met on Friday, and the verdict was announced on Monday.
Complex One independent + one or more dependent 1 Ind. + 1+ Dep. Although the evidence was compelling, the committee requested further review.
Compound-Complex Two+ independent + one+ dependent 2+ Ind. + 1+ Dep. Although the funding was delayed, the project continued, and the team exceeded target.

1.8 Subordinating Conjunctions: A Reference Guide

Relationship Subordinating Conjunctions Notes on Use
Time after, before, when, while, since… While for simultaneous; after/before for sequence.
Cause / Reason because, since, as, given that… Because is strongest. Since/as can be ambiguous (time vs reason).
Condition if, unless, provided (that), in case… Unless = if not. Provided = strong condition.
Concession although, even though, while, whereas… Acknowledge a fact that contrasts with the main clause.
Purpose so that, in order that, lest So that is most common. Lest is formal.
Result so…that, such…that These split around adjectives or nouns.
Manner as, as if, as though Hypothetical manner comparisons.
Comparison than, as…as Often reduced (verb omitted).
Place where, wherever Modifies verbs of position or movement.

1.9 Common Errors Involving Clauses

1.9.1 The Sentence Fragment

COMMON ERROR

Fragment: Although the committee had reviewed the evidence extensively.

Corrected: Although the committee had reviewed the evidence extensively, no clear conclusion was reached.

1.9.2 The Run-On Sentence

COMMON ERROR

Run-on: The survey was completed last month the results have not yet been published.

Corrected: The survey was completed last month; however, the results have not yet been published.

1.9.3 The Comma Splice

COMMON ERROR

Comma splice: The application was submitted on time, the decision is expected next week.

Corrected: The application was submitted on time, and the decision is expected next week.

Note: A conjunctive adverb (however, therefore) does NOT fix a comma splice on its own.

1.9.4 The Dangling Modifier

COMMON ERROR

Dangling: While reviewing the contract, several inconsistencies were noticed.

Correct: While reviewing the contract, the solicitor noticed several inconsistencies.

1.9.5 Misplaced Relative Clauses

COMMON ERROR

Misplaced: The councillor addressed the residents about the parking scheme who had complained.

Correct: The councillor addressed the residents who had complained about the parking scheme.

1.10 Clauses in Formal and Academic Writing

1.10.1 Using Subordination for Precision

Subordination allows writers to show exactly how two ideas are related. Coordinating two ideas treats them as equal; subordinating one makes clear which idea is primary.

1.10.2 Avoiding Over-Subordination

STYLE NOTE: Too many nested dependent clauses can make it difficult to follow the main idea.

1.10.3 Front-Loading vs. End-Loading

Strategy Example Effect
Front-loaded Because the data was compromised, the dataset was withdrawn. Context first, conclusion last. Good for explanations.
End-loaded The dataset was withdrawn because the data was compromised. Main point first, reason follows. Good for reports.

1.11 Summary

  1. A clause is a group of words containing both a subject and a finite verb.
  2. An independent clause expresses a complete thought and can stand alone.
  3. A dependent clause cannot stand alone.
  4. Three types of dependent clause: Noun, Adjective (Relative), and Adverb.
  5. Restrictive clauses = no commas. Non-restrictive = commas.
  6. That for restrictive; Which for non-restrictive.
  7. Sentence types: Simple, Compound, Complex, Compound-Complex.
  8. Common errors: Fragments, run-ons, comma splices, dangling modifiers, misplaced clauses.
  9. Subordination is a tool for showing relationships between ideas.
  10. Vary sentence types for clarity and rhythm.

1.12 Practice Exercises

Exercise A — Clause or Phrase?

State whether each underlined group of words is a clause or a phrase. If it is a clause, state whether it is independent or dependent.

  1. The director announced the results [after a brief delay].
  2. [Having reviewed all available evidence], the panel reached its verdict.
  3. She was confident [that the proposal would be accepted].
  4. [The committee’s final recommendation] was presented to the board.
  5. [When the funding is confirmed], construction will begin.
  6. The architect designed the extension [to maximise natural light].
  7. [The witness who gave the most detailed account] was questioned for over an hour.
  8. The report concluded [that immediate action was required].

Exercise B — Identifying Clause Type

Identify the underlined dependent clause as a noun clause, adjective (relative) clause, or adverb clause. State its function within the sentence.

  1. [What the audit revealed] was far more serious than anyone had expected.
  2. The inspector, [who had conducted over two hundred assessments], found no violations.
  3. She left the meeting early [because she had a prior engagement].
  4. The committee acknowledged [that errors had been made].
  5. The contractor [whom we originally hired] withdrew before work began.
  6. [Although the initial findings were encouraging], further testing was required.
  7. The suggestion [that all records be digitised] met with unanimous approval.
  8. He stored the files [where no unauthorised person could access them].

Exercise C — Restrictive vs. Non-Restrictive

State whether each relative clause is restrictive or non-restrictive. Add commas where required. Then explain how removing the relative clause would affect the meaning.

  1. The regulation that was introduced in March applies to all commercial properties.
  2. The report which was commissioned by the government was released without redaction.
  3. Candidates who have prior experience in project management will be prioritised.
  4. Dr. Eleanor Firth who chairs the academic standards committee will deliver the keynote.
  5. The equipment that was damaged in the flood has been replaced.
  6. The northern bridge which dates back to the eighteenth century will undergo renovation.
  7. All staff who work in the data centre must complete the security clearance.
  8. The original manuscript which is housed in the national library has never been fully transcribed.

Exercise D — Sentence Classification

Classify each sentence as simple, compound, complex, or compound-complex. Identify the independent and dependent clauses.

  1. The inspector submitted her report.
  2. The application was reviewed, but the decision has not yet been communicated.
  3. Before the new regulations came into force, the industry operated under a voluntary code.
  4. The research team, which had been working on the project for four years, finally published its results, and the academic community responded with considerable interest.
  5. She drafted the report, revised it twice, and submitted the final version before the deadline.
  6. Because the initial contractor withdrew, the project was delayed, and the board was forced to reopen the tender.
  7. The findings that were presented at the conference have since been contested.
  8. The committee met on Thursday; the announcement was made the following morning.

Exercise E — Error Identification and Correction

Each item below contains a sentence error related to clauses. Identify the error and rewrite the sentence correctly.

  1. The panel reviewed all the evidence, it reached a unanimous verdict within two hours.
  2. Although the project was completed on time and within the agreed budget.
  3. The consultant presented the findings to the board that had taken eight months to compile.
  4. The meeting was productive the delegates agreed on three key action points.
  5. After reviewing all the applications, the shortlist was drawn up by the selection committee.
  6. What the new legislation means for small businesses operating in rural areas and how it will be enforced.
  7. The report was thorough, however it failed to address the long-term financial implications.
  8. While conducting the site inspection, several structural faults were identified.

Exercise F — Combining Sentences Using Clauses

Combine each pair or group of sentences into a single sentence of the type specified.

  1. The survey was conducted in October. The results have not yet been published. [Complex — use although]
  2. The chief engineer retired last spring. She had overseen every major project for twenty years. [Complex — use a relative clause]
  3. The board approved the merger. Shareholders were notified immediately. [Compound — use a semicolon]
  4. The deadline was extended. The team had requested additional time. The project required more data. [Compound-complex]
  5. The application was incomplete. It was submitted after the closing date. It was rejected. [Complex — use because and as]
  6. Something was clear. The original estimate had significantly undervalued the scope of the work. [Use a noun clause as subject]

Answer Key

Exercise A — Answers

# Type Notes
1Phrase (prepositional)No subject + finite verb.
2Phrase (participial)“Having reviewed” is non-finite; no subject.
3Clause (noun clause)Dependent — introduced by that; object of was confident.
4Phrase (noun phrase)No verb.
5Clause (adverb clause)Dependent — introduced by when; modifies will begin.
6Phrase (infinitive phrase)Non-finite; no subject.
7Clause (relative clause)Dependent — introduced by who; modifies The witness.
8Clause (noun clause)Dependent — introduced by that; object of concluded.

Exercise B — Answers

  1. Noun clause — Subject of the main verb was.
  2. Adjective (relative) clause — Non-restrictive; modifies the inspector.
  3. Adverb clause — Reason; modifies left (verb).
  4. Noun clause — Direct object of acknowledged.
  5. Adjective (relative) clause — Restrictive; identifies which contractor.
  6. Adverb clause — Concession; modifies the main clause.
  7. Noun clause (appositive) — Renames/identifies the suggestion.
  8. Adverb clause — Place; modifies stored.

Exercise C — Answers

  1. Restrictive; No commas. Removal would not specify which regulation.
  2. Non-restrictive; Add commas: “…report, which was commissioned…, was released…”
  3. Restrictive; No commas. Would apply to all candidates, not just experienced ones.
  4. Non-restrictive; Add commas: Dr. Eleanor Firth, who chairs…, will deliver…
  5. Restrictive; No commas. Identifies which equipment (flood-damaged).
  6. Non-restrictive; Add commas: The northern bridge, which dates…, will undergo…
  7. Restrictive; No commas. Identifies which staff.
  8. Non-restrictive; Add commas: The original manuscript, which is housed…, has never…

Exercise D — Answers

  1. Simple: One independent clause.
  2. Compound: Ind 1: application reviewed. Ind 2: decision not communicated.
  3. Complex: Dep (adverb): Before regulations… Ind: industry operated…
  4. Compound-Complex: Rel clause (dep): which had been working… Ind 1: team published. Ind 2: community responded.
  5. Simple: One independent clause with compound predicate (drafted, revised, submitted).
  6. Compound-Complex: Adv clause (dep): Because contractor withdrew. Ind 1: project delayed. Ind 2: board forced to reopen.
  7. Complex: Rel clause (dep): that were presented… Ind: findings have been contested.
  8. Compound: Ind 1: committee met. Ind 2: announcement made.

Exercise E — Answers

  1. Error: Comma splice. Correct: The panel reviewed all the evidence; it reached a unanimous verdict.
  2. Error: Sentence fragment. Correct: Although the project was completed on time, the client expressed reservations.
  3. Error: Misplaced relative clause. Correct: The consultant presented to the board the findings that had taken eight months to compile.
  4. Error: Run-on sentence. Correct: The meeting was productive; the delegates agreed on action points.
  5. Error: Dangling modifier. Correct: After reviewing all the applications, the selection committee drew up the shortlist.
  6. Error: Sentence fragment. Correct: What the legislation means and how it will be enforced remains to be clarified.
  7. Error: Comma splice. Correct: The report was thorough; however, it failed to address implications.
  8. Error: Dangling modifier. Correct: While conducting the site inspection, the engineer identified faults.

Exercise F — Sample Answers

  1. Although the survey was conducted in October, the results have not yet been published.
  2. The chief engineer, who had overseen every major project for twenty years, retired last spring.
  3. The board approved the merger; shareholders were notified immediately.
  4. Because the project required more data and the team had requested additional time, the deadline was extended, and the work continued into the following quarter.
  5. Because the application was incomplete and as it was submitted after the closing date, it was rejected.
  6. What was clear was that the original estimate had significantly undervalued the scope of the work.

Glossary of Key Terms

Term Definition
ClauseA group of words containing both a subject and a finite verb.
Independent clauseExpresses a complete thought and can stand alone; also called a main clause.
Dependent clauseContains a subject and finite verb but cannot stand alone.
SubjectThe noun/pronoun the clause is about.
PredicatePart containing the finite verb that says something about the subject.
Finite verbA verb form showing tense and agreeing with the subject.
Non-finite verbVerb form (infinitive/gerund) that does not show tense.
Noun clauseDependent clause functioning as a noun.
Adjective clauseDependent clause modifying a noun (relative clause).
Adverb clauseDependent clause modifying a verb/adj/adv.
Relative clauseAdjective clause introduced by a relative pronoun/adverb.
Restrictive clauseEssential identifying info; no commas.
Non-restrictiveSupplementary info; requires commas.
AntecedentThe noun/pronoun a relative clause modifies.
Subordinating conjunctionIntroduces a dependent adverb clause (because, if).
Coordinating conjunctionJoins equal independent clauses (FANBOYS).
Conjunctive adverbShows logical relationship between independent clauses (however, therefore).
Sentence fragmentGroup of words punctuated as a sentence but lacking an independent clause.
Run-on sentenceIndependent clauses joined without punctuation.
Comma spliceIndependent clauses joined by a comma alone.
Dangling modifierImplied subject of a phrase doesn’t match main subject.
Simple sentenceExactly one independent clause.
Compound sentenceTwo or more independent clauses; no dependent clauses.
Complex sentenceOne independent clause + one or more dependent clauses.
Compound-complexTwo+ independent clauses + one+ dependent clauses.

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