摘要：定语从句 在复合句中.修饰某一名词或代词.或修饰整个主句的从句叫做定语从句.引导定语从句的关系代词有who, whom, whose, which, that, as,和关系副词when, where, why. (1)that指物时一般可与which互换.但在下列情况下.要用that而不用which. a. 先行词有all, everything等不定代词时.如. Everything he did is wrong. b. 先行词被all, every, no, some, any, little, much等修饰时.如. I'll read all the books you lend me. c. 先行词被序数词或形容词最高级修饰时. This is the first letter the boy has written. d. 先行词被the only, the very, the same, the last修饰时.如 He is the very man I'm looking for. e. 只用which的情况 在介词后或在非限定性定语从句中 This is the book about which we have talked a lot. The book, which he gave me yesterday, is very interesting. f. where和when作关系副词 This is the room where I worked. This is the room which I stayed in. I remembered the day when we lived there. I remembered the day that I spent there. g. as和which as 可以放于句首.而which 不可以 As you know, he is good at English. three of them 和three of which I have a lot of books, three of which are in Russian. I have a lot of books and three of them are in Russian.

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