定语从句中定语从句中 which,that 的用法与区别的用法与区别只能使用只能使用 that 的情况：的情况：1.当先行词是当先行词是 nothing, something, anything, all, each 等不定代词时。等不定代词时。e.g. Do you have anything that is important to tell me?2.当先行词被当先行词被 all, any, some, no, not, every, each 等修饰时。等修饰时。e.g. I have some books that are very good.3.当先行词被形容词最高级、序数词当先行词被形容词最高级、序数词(包括包括 last, next 等等)所修饰时。所修饰时。e.g. This is the first book that I bought myself.The biggest bird that I caught is this bird.4.主句是以主句是以 which 或或 who 开头的特殊疑问句时开头的特殊疑问句时e.g. Which is the bike that you lost? 为了避免重复时用为了避免重复时用 thatWho is the woman that was praised at the meeting.5.当先行词在从句和主句中都作表语时当先行词在从句和主句中都作表语时,无论先行词是人还是物无论先行词是人还是物.China is no longer the country that she was.6.如有两个定语从句如有两个定语从句,其中一个已用其中一个已用 which 引导引导,另一个宜用另一个宜用 that .Edison built up a factory which produced things that had never been seen before.7.在在 there be 句型中句型中,只用只用 that.He asked for the latest book (that) there is on the subject.8.当先行词被当先行词被 the very, the last, the next, the only，the same 等词修饰时等词修饰时。e.g. This is the very book that I lost yesterday.9.当先行词又有人又有物时。当先行词又有人又有物时。e.g. I wont forget the things and the persons that I saw.10. 先行词被先行词被 all, every, no, any, little, some, much 等修饰时。等修饰时。Ive read all the books that are not mine. 只能使用只能使用 which 的情况的情况。1、非限制性定语从句(即通常用逗号与主句隔开，如果去掉逗号， 整个句子仍能表达 完整的意义的定语从句)中。e.g. Mary has a book, which is very precious.2、在介词之后。e.g. This is a house in which lives an old man.3、当主句中的主语被 that 修饰时。e.g. That dog which I found in the street belongs to Mary.4. 非限定性定语从句修饰的是前面的整个句子，而且关系代词和关系副词前面有逗号, 用 which 开始的定语从句修饰前面半句e.g. He will wear no clothes, which will distinguish（区分，辨别）him from his fellow men.