Adjective Clause
“A dependent clause that functions as an adjective in a sentence is called adjective clause.”
An adjective clause works like adjective in a sentence. The function of an adjective is to modify (describe) a noun or a pronoun. Similarly a noun clause modifies a noun or a pronoun.
Example
He wears a shirt which looks nice.
The clause “which looks nice” in above sentence is an adjective clause because it modifies noun “shirt” in the sentence.
An adjective clause always precedes the noun it modifies.
Examples.
I met the boy who had helped me.
An apple that smells bad is rotten.
The book which I like is helpful in preparation for test.
The house where I live consists of four rooms.
The person who was shouting needed help.
Adjective clause begins with relative pronoun (that, who, whom, whose, which, or whose) and is also relative clause.
Adjective (relative) clauses can be restrictive clause or nonrestrictive clause