非限制性定语从句引导词有哪些

非限制性定语从句引导词有：which、who、whom、whose。具体用法：非限制性定语从句不可用that引导，在非限制性定语从句中用who(作主语)/whom(作宾语)指人，用which(作主语/宾语)指物，用whose作定语(指人/物)。关系代词在非限制性定语从句中作宾语时不可省略，若指人时，只用whom，不用who。

非限制性定语从句不可用why引导，需用forwhich替代why。非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明，通常和主句间用逗号隔开，将从句拿掉后其他部分仍可成立。

非限制性定语从句不能用that引导。如：I like the book，which was bought yesterday我喜欢这本书，这是昨买的。I like the book which/that was bought yesterday我喜欢昨天买的那本书。

非限制性定语从句不能用why引导。要用for which代替why如：I had told them the reason，for which I didn’t attend the meeting我把理由告诉了他们，为此我不用去开会。I had told them the reason why/for which I didn’t attend the meeting。我告诉了他们我不去开会的理由。