定语从句中什么时候用that而不用which

定语从句中什么时候用that而不用which

简单的说：
介词后只能用which不能用that
先行词为 xxx-thing 时只能用that
先行词被the only（含序数词）等限定词修饰时只能用that
先行词被最高级修饰时只用that

具体的说：限制性定语从句只能用that 的几种情况
1．当先行词是anything, everything, nothing(something 除外), few, all, none, little, some 等代词时，或者是由every, any, all, some, no, little, few, much 等修饰时
(1) Have youtaken down everything that Mr. Li has said?
注意：当先行词指人时，偶尔也可以用who
(1) Any man that/.who has a sense ofduty won't do such a thing.
2. 当先行词被序数词修饰
(1) The first place that they visited in London was the Big Ben.
3. 当先行词被形容词最高级修饰时
(1)This is the best film that I have seen.
4. 当形容词被the very, the only修饰时
(1)This is the very dictionary that I want to buy,
当先行词指人时，偶尔也可以用who
(1)Wang Hua is the only person in our school who will attend the meeting/
5. 当先行词前面有who, which等疑问代词时
(1)Who is the man that is standing there?
6. 当先行词既有人，也有动物或者物体时
(1)Can you remember the scientist and his theory that we have learned?

that与which的用法区别
两者都可指物，常可互换。其区别主要在于：

1. 引导非限制性定语从句时，通常要用which：

2. 直接放在介词后作宾语时，通常要用which：

3. 当先行词是下列不定代词或被它们修饰时much, little, none, all, few, every(thing), any(thing), no(thing) 等时，通常用that：

4. 当关系代词在定语从句中用作表语时，通常用that：

China is not the country (that) it was. 中国已不是过去的中国了。
5. 当要避免重复时：

Which is the course that we are to take? 我们选哪门课程？

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