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My granddaughter and I were discussing the use of "which" and "that" in grammatically correct sentences. She is teaching a course and drew a complete blank as to the rule. Is there a specific rule which deals with this?
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Dear Adrienne,

Well, if you are talking about the use of 'which' and 'that' in relative clauses, some books say that you must only use 'that' to express a restrictive meaning, but others say that 'which' is acceptable too.

Ryan