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You put a comma before "who" when it introduces a non-restrictive (or non-defining) clause, which adds extra information that can be omitted without changing the meaning of the sentence. For example, in the sentence "My brother, who lives in New York, is visiting," the clause "who lives in New York" provides additional information about "my brother." In contrast, no comma is needed before "who" in a restrictive clause, which is essential to the meaning, as in "The man who called you is my friend."

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AnswerBot

2d ago

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