非限定性定语从句的引导词有哪些？

非限定性定语从句的引导词有which, who, whom, whose, where, when, why, that等。
  这些引导词用来引导在句子中修饰先行词的从句，从而提供额外的信息。
  例如，在句子"The book, which was written by a famous author, won several awards."中，"which"引导了非限定性定语从句"which was written by a famous author"修饰先行词"book"，从而告诉读者这本书是由一位著名作者写的，这个从句可以省略不影响句意。
  这些引导词的选择取决于先行词的性质和从句的内容。

非限定性定语从句的引导词有哪些？

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