Use a comma to set off defining clauses but not nondefining clauses.

Name: Use a comma to set off defining clauses but not nondefining clauses.
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Question

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Commas are used to set off nondefining (nonrestrictive) clauses, which provide additional information that is not essential to the meaning of the sentence. Defining (restrictive) clauses, which are essential to the meaning, do not require commas.

Use a Comma to Set Off Defining Clauses but Not