Adjective clauses (also called relative clauses) have the same function that adjectives or appositions have in a sentence. They specify a preceding noun, noun phrase, or pronoun. Relative clauses are linked to the main clause with relative pronouns.
Gérard, qui est mon cousin, est venu me
voir.
(Gérard, who is my cousin, came to see me.)
(qui est mon cousin/adjective clause).
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