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A clause is a collection of grammatically-related words including a predicate and a subject (though sometimes is the subject is implied). A collection of grammatically-related words without a subject or without a predicate is called a phrase.

Clauses are the building blocks of sentences: every sentence consists of one or more clauses. This chapter will help you to recognize and (more importantly) to use different types of clauses in your own writing.

Recognizing Clauses

Consider these examples:

clause
cows eat grass

This example is a clause, because it contains the subject "cows" and the predicate "eat grass."

phrase
cows eating grass

What about "cows eating grass"? This noun phrase could be a subject, but it has no predicate attached to it: the adjective phrase "eating grass" show which cows the writer is referring to, but there is nothing here to show why the writer is mentioning cows in the first place.

clause
cows eating grass are visible from the highway

This is a complete clause again. The subject "cows eating grass" and the predicate "are visible from the highway" make up a complete thought.

clause
Run!

This single-word command is also a clause, even though it does seem to have a subject. With a direct command, it is not necessary to include the subject, since it is obviously the person or people you are talking to: in other words, the clause really reads "[You] run!". You should not usually use direct commands in your essays, except in quotations.

Using Clauses as Nouns, Adjectives, and Adverbs

If a clause can stand alone as a sentence, it is an independent clause, as in the following example:

Independent
the Prime Minister is in Ottawa

Some clauses, however, cannot stand alone as sentences: in this case, they are dependent clauses or subordinate clauses. Consider the same clause with the subordinating conjunction "because" added to the beginning:

Dependent
when the Prime Minister is in Ottawa

In this case, the clause could not be a sentence by itself, since the conjunction "because" suggests that the clause is providing an explanation for something else. Since this dependent clause answers the question "when," just like an adverb, it is called a dependent adverb clause (or simply an adverb clause, since adverb clauses are always dependent clauses). Note how the clause can replace the adverb "tomorrow" in the following examples:

adverb
The committee will meet tomorrow.
adverb clause
The committee will meet when the Prime Minister is in Ottawa.

Dependent clauses can stand not only for adverbs, but also for nouns and for adjectives.

 

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Noun Clauses

Adjective Clauses

Adverb Clauses