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Adverb clauses: An adverb clause is a dependent clause that, like an adverb, modifies an adjective, an adverb, or a verb or verb phrase. An adverb clause begins with words such as after, although, because, before, if, since, than, until, when, and while.
Adjective clauses: An adjective clause is a dependent clause that, like an adjective, modifies a noun or pronoun. An adjective clause begin with words such as that, when, where, who, whom, whose, which, and why.
Noun clauses: A noun clause is a dependent clause that acts as a noun. Noun clauses begin with words such as how, that, what, whatever, when, where, whether, which, whichever, who, whoever, whom, whomever, and why.
