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A clause is a group of words that contains a subject and a verb.
An adjective clause is a clause that acts as an adjective. That is, it modifies the noun or pronoun that comes before it:
Most adjective clauses start with the relative pronouns which, who or that.
Relative pronouns can act as a subject or an object in the adjective clause. (For instance, in the examples above, the pronouns which and who are the subjects of the verbs is and stole, while that is the object of the verb bought.)
We sometimes omit that when it is the object of a verb or preposition:
For more information on relative pronouns, see the article RELATIVE PRONOUNS, WHO, WHOM, WHOSE, WHICH, THAT.
The relative adverbs when, where and why can also start an adjective clause:
For information on how to punctuate adjective clauses, see the article COMMAS WITH ADJECTIVE CLAUSES.
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