Adjective clauses almost always come right after the nouns they modify. There is the mountain that we are going to climb. My blue tennis shoes, which used to be my mom's, were under the bed. Daniel, who was late again today, sits next to me in English.
Students who want to go on the field trip must bring a permission slip to understand adjectives. The adjective clause is underlined. It is an "adjective" clause because it describes the noun "students.
An adjective clause will generally start off with words like who, whom, whose, when, where, which, that, and why. An adjective clause is always a dependent clause, which means that by itself it would not form a complete sentence.
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