Jawaban:

When reducing an adjective clause to an adjective phrase, there are a few things to pay attention to:

-The adjective phrase must modify a noun or pronoun in the main clause.

-The relative pronoun in the adjective clause (who, whom, whose, that, or which) must be removed.

-The verb in the adjective clause must be changed to its present participle form (-ing form) or past participle form (-ed form) if necessary.

-The subject of the adjective clause may need to be changed to the object of the preposition or omitted altogether.

-The resulting adjective phrase must make sense and be grammatically correct in the context of the sentence.

It's important to note that not all adjective clauses can be reduced to adjective phrases, and even when they can, it may change the meaning or emphasis of the sentence. Therefore, it's important to carefully consider the context and intended meaning before reducing an adjective clause.