In a short sentence, finding the subject and verb is usually straightforward. Longer sentences can be less obvious. They may contain several verbs, and one clause can sit inside another without a comma or connecting word to mark it.
Understanding how clauses fit together helps you recognize the main statement, see what the other parts add, and make sense of sentences that initially look complicated.
What Is a Clause in Grammar?
A clause is a grammatical unit built around a verb. In a typical English clause, there is also a subject that tells us who or what the clause is about.
Some clauses can form complete sentences on their own. Others function as part of a larger sentence.
Consider:
The audience remained silent.
This is a clause with the subject the audience and the verb remained. It also forms a complete sentence.
Now look at:
while the judges reviewed the results
This is another clause. It contains the subject the judges and the verb reviewed, but while introduces a dependent relationship.
Put them together:
The audience remained silent while the judges reviewed the results.
The first clause makes the main statement. The second tells us when the audience remained silent.
A clause doesn’t have to be a complete sentence. It can also contribute information within a larger grammatical structure.
How Is a Clause Structured?
Most English clauses contain a subject and a predicate.
The subject identifies who or what the clause is about. The predicate contains the verb and tells us something about that subject.
For example:
The restoration team uncovered a hidden doorway behind the staircase.
| Part | Words | Function |
|---|---|---|
| Subject | The restoration team | Identifies who performed the action |
| Verb | uncovered | Expresses the action |
| Object | a hidden doorway | Identifies what was uncovered |
| Additional information | behind the staircase | Tells us where it was uncovered |
| Complete predicate | uncovered a hidden doorway behind the staircase | Tells us what the subject did |
A predicate may contain more than just a verb. It can also include objects, complements, and other elements that complete or expand the meaning.
Not every clause describes an action, however.
The proposed route seems impractical.
Here, the proposed route is the subject, seems is a linking verb, and impractical is a subject complement describing the route.
In questions, the usual subject–verb order may change:
Has the council approved the revised plan?
The subject is the council, but the helping verb has appears before it. The complete verb phrase is has approved.
The subject doesn’t always come before the verb, so word order alone won’t tell you where a clause begins.
Independent and Dependent Clauses
One of the most important distinctions in English grammar is between independent clauses and dependent clauses.
An independent clause, also called a main clause, can form a complete sentence.
A dependent clause, also called a subordinate clause, functions within a larger grammatical structure and cannot normally stand alone as a complete sentence.
Compare:
| Independent clause | Dependent clause |
|---|---|
| The laboratory reopened. | after the equipment passed inspection |
| Can form a sentence on its own | Depends grammatically on a larger structure |
| Also called a main clause | Also called a subordinate clause |
Together, they form:
The laboratory reopened after the equipment passed inspection.
The main clause tells us what happened. The dependent clause indicates when it happened.
Dependency isn’t always about an idea being impossible to understand on its own, though.
The director confirmed that the exhibition would continue.
The clause that the exhibition would continue expresses a clear idea. Grammatically, it functions as the content of what the director confirmed, making it a subordinate clause.
A clause can express an understandable idea while remaining grammatically dependent on another part of the sentence.
The distinction is explored further in dependent vs. independent clauses.
Main Types of Dependent Clauses
Dependent clauses can also be classified according to the role they perform within a sentence.
What the investigators discovered changed the direction of the inquiry.
The bold clause functions as the subject of the larger sentence.
Relative clause (adjective clause)
The architect who designed the theatre attended the reopening.
The bold clause identifies which architect is being discussed.
The match was suspended because the floodlights failed.
The bold clause explains why the match was suspended.
These categories describe what subordinate clauses do. They don’t replace the independent/dependent distinction.
For a fuller explanation of their classifications, see types of clauses in English grammar.
Clause vs. Phrase vs. Sentence
A phrase, a clause, and a sentence can all contain several words, but they are not the same grammatical unit.
Consider these examples:
Phrase: during the final inspection
Dependent clause: while the inspector examined the wiring
Sentence: The building remained closed while the inspector examined the wiring.
In traditional classroom grammar, the first example is a prepositional phrase. It has no subject–finite verb structure of its own.
The second contains the subject the inspector and the finite verb examined, making it a dependent clause.
The third is a complete sentence containing a main clause and a subordinate clause.
A phrase can form part of a clause, and a clause can form part of a sentence. A single independent clause can also constitute an entire sentence.
Some grammatical frameworks recognize non-finite clauses that traditional school grammar describes as phrases. That distinction matters in advanced grammatical analysis, but the examples above illustrate the usual introductory comparison.
For more detailed examples and structural differences, see phrase vs. clause.
How to Identify Clauses in a Sentence
A sentence may contain several verb words without having several clauses. It may also contain a clause that’s easy to miss because it’s embedded within a larger group of words.
The following examples show how these structures differ.
How Small Structural Changes Affect Clause Count
| Sentence | Clause analysis |
|---|---|
| The editor reviewed the manuscript. | One independent clause |
| The editor had been reviewing the manuscript. | One independent clause with a multiword verb phrase |
| The editor reviewed and approved the manuscript. | One independent clause with a compound predicate in traditional school grammar |
| The editor reviewed the manuscript, and the publisher approved it. | Two independent clauses |
| The editor approved the manuscript that the translator had revised. | A main clause containing a dependent relative clause |
The first sentence has a single subject and verb.
In the second, had been reviewing is one verb phrase. Three verb words do not create three clauses.
The third sentence contains two coordinated verbs, reviewed and approved, sharing the subject the editor. Traditional school grammar treats this as one clause with a compound predicate.
In the fourth, the conjunction and joins two separate subject–verb structures. Each could stand alone as a complete sentence.
The final sentence introduces an embedded relative clause, that the translator had revised, which identifies the manuscript.
Finding a Clause Inside Another Structure
Consider:
The report the consultant submitted contained several errors.
The central statement is:
The report contained several errors.
But the subject noun phrase the report the consultant submitted contains another clause.
The words the consultant submitted form a defining relative clause with an omitted relative pronoun referring to the report.
We could write the full version as:
The report that the consultant submitted contained several errors.
The relative clause identifies which report contained the errors.
The original sentence therefore has two finite clauses, even without a comma or a visible relative pronoun separating them.
A more complex example shows how several clauses can fit together:
Although the library was closing, the students continued reading the documents that the archivist had prepared.
There are three finite clauses:
| Clause | Function |
|---|---|
| Although the library was closing | Dependent adverbial clause introducing a concession |
| the students continued reading the documents that the archivist had prepared | Main clause expressing the central statement |
| that the archivist had prepared | Embedded relative clause identifying the documents |
The relative clause sits inside the object noun phrase the documents that the archivist had prepared.
It is part of the main clause’s larger structure, not another independent clause joined to it.
Without the subordinate clauses, the central statement becomes:
The students continued reading the documents.
The shorter version leaves out the concession and the information identifying the documents, but it makes the main grammatical structure easier to see.
Clauses That Don’t Follow the Usual Pattern
The subject–finite verb pattern works well for identifying many English clauses, but not every clause has an explicitly stated subject or a finite verb.
Imperative Clauses
Commands commonly omit the subject because the person being addressed is understood.
Stop!
This single word functions as a complete imperative clause. Its verb is stop, and its understood subject is you.
The same pattern appears in:
Leave the access road clear.
Although no subject is written, the instruction is directed at the listener.
A clause can therefore consist of just one written word.
Non-Finite Clauses
A finite clause contains a verb phrase marked for tense or grammatical mood. A non-finite clause is built around a verb form such as to leave, leaving, or left, which does not independently mark tense.
Consider:
To prevent further leaks, the maintenance crew sealed the roof.
The opening construction to prevent further leaks expresses purpose. Its understood subject is the maintenance crew.
Traditional classroom grammar often calls this an infinitive phrase. Modern grammatical descriptions can analyze it as a non-finite subordinate clause.
The terminology depends on the grammatical framework being used. For an introductory lesson, the important point is that not every clause follows the familiar pattern of an explicitly stated subject and a finite verb.
How Clause Structure Can Change Meaning
Sometimes a small change in how a clause is presented changes what a sentence communicates.
Compare:
The applicants who submitted their documents early received confirmation.
Here, who submitted their documents early is a defining relative clause. It identifies which applicants received confirmation.
Now look at:
The applicants, who submitted their documents early, received confirmation.
The commas mark the relative clause as non-defining. The applicants are already identifiable from the context, and the clause adds information about their early submission.
In the first sentence, the clause helps establish which applicants are being discussed. In the second, it supplies extra information about applicants already identified.
The wording is almost identical, but the role of the relative clause changes.
Check Your Understanding
Try identifying the clauses in these sentences before reading the explanations.
1. Identify the Independent Clause
Although the ferry had been delayed, the passengers remained calm.
Answer: The passengers remained calm is the independent clause.
Although the ferry had been delayed is a dependent adverbial clause. The verb phrase had been delayed belongs to that single subordinate clause; its three verb words do not represent three clauses.
2. Find the Embedded Clause
The photographs that the gallery acquired last month attracted considerable attention.
Answer: that the gallery acquired last month is a defining relative clause modifying photographs.
The main clause expresses that the photographs attracted considerable attention. The relative clause identifies the photographs being discussed.
3. Does This Sentence Contain More Than One Clause?
The narrow path through the orchard disappeared beneath the fallen leaves.
Answer: No. It contains one independent finite clause.
The subject is the narrow path through the orchard, and the predicate is disappeared beneath the fallen leaves.
Both through the orchard and beneath the fallen leaves are prepositional phrases. Neither contains its own subject–finite verb relationship.
4. How Many Finite Clauses Are Present?
The passengers the airline contacted had already boarded another flight.
Answer: Two finite clauses.
The central statement is that the passengers had already boarded another flight.
The airline contacted is the visible part of an embedded defining relative clause modifying passengers. Its object relative pronoun has been omitted.
We could make that relationship explicit:
The passengers whom the airline contacted had already boarded another flight.
In less formal English, who or that could also be used.
The relative clause sits inside the subject noun phrase of the main clause. Identifying it requires recognizing the grammatical relationship, even when the relative pronoun isn’t written.
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