How To Use Nonrestrictive clause In A Sentence

• You use which in nonrestrictive clauses, and if you eliminate a nonrestrictive clause, the meaning of the remaining part of the sentence will be the same as it was before. Grammar Girl: Which Versus That « Write Anything
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• You can think of a nonrestrictive clause as simply additional information. Grammar Girl: Which Versus That « Write Anything
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• the nonrestrictive clause in `I always buy his books, which have influenced me greatly,' refers to his books generally and adds an additional fact about them
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• At the same time, the instruction to put a comma before a nonrestrictive clause is not unique to Strunk & White but can be found in many writing texts. The Volokh Conspiracy » From Language Log to the New York Times Magazine
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• A nonrestrictive clause is something that can be left off without changing the meaning of the sentence. Grammar Girl: Which Versus That « Write Anything
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