请问在定语从句中which和that用法有什么区别
在定语从句当中，which和that都是关系代词，一般情况下可以通用。但是也有区别，在一些情况下只能用that，一些情况下只能用which。
只能用that而不能用which的情形
(1) 当先行词为：all, little, few, much, none 及 some-, any-, no-, every- 与 thing 所组成的复合单词时，只能用that。如：
There is nothing that will stop us making progress. 没有事情会阻止我们进步。
(2) 当先行词前面有only, some, any, no, every, little, few, much, all, very等形容词修饰时，只能用that。如：
This is the only problem that we can’t work out. 这是我们不能解决的唯一的一个问题。
(3) 当先行词由形容词的最高级或序数词修饰时，只能用that。如：
This is the most interesting book that I have ever read. 这是我读过的最有趣的书。
(4) 当先行词同时包括人和物时，只能用that。如：
Luxun and his works that we are familiar with are considered great. 人们认为我们所熟识的鲁迅及其作品都很伟大。
(5) 当先行词在定语从句 中作表语时，只能用that。如：
This is a book that I have been looking for since last week. 这就是那本自上周以来我一直在寻找的书。
(6) 当主句是以 which 开头的特殊疑问句时，只能用 that。如：
Which is the picture that you drew yesterday? 你昨天画的那张画是哪一张?
只能用which而不能用that的情形
(1) 当非限制性定语从句中的先行词指物时，只能用 which。如：
The pencil-case, which I bought last week, is missing. 那个铅笔盒，我上周买的，现在不见了。
(2) 关系代词 前面有介词时，只能用which。如：
The tree under which we used to take a rest has been cut down. 我们过去常在下面休息的那棵树已砍掉了。
(3) 先行词为代词 that 或 that 所修饰时，只能用 which。如：
I don’t take that which is too expensive. 我不要太贵的那一个。
①先行词为不定代词,all,much,something,everything,anything,nothing,none,the one等,
1.We should do all that is useful to the people .
2.There's nothing that can be said about it .
3.Do you mean the one that was bought yesterday?
②先行词被only, any, few, little, no, just, very, one of等词修饰时.
1.The only thing that we could do was to wait.
2.That's the very word that is wrongly used.
The last place (that) we visited was the chemical works.
You can take any (=whichever) seat that is free.
I hope the little that I can will be of some help to them.
比较 *This is one of the best novels that were published last year.
*This is the only one of the best novels that was published last year.
③先行词是序数词时或被序数词修饰时.
1.When we talk about Wuxi, the first that comes into mind is Tai Lake.
2.This is the third film that has been shown in our school this term.
④先行词是最高级或被最高级修饰时.
1.This is the best that can be done now.
2.The most important thing that should be done right now is how to stop him from going on.
⑤先行词既有人又有物,用which和who都不适合,这时宜用that. 如：
1.The writer and his novel that you have just talked about is really well known .
2.The rider and his bike that had run over an old woman were held up by the police.
⑥被修饰词为数词时.
1.Yesterday I caught two fish and put them in a basin of water .Now you can see the two that are still alive .
⑦如果有两个从句,其中一个关系代词已用which ,另一个关系代词宜用that,以避免语言的单调或重复.
Edison built up a factory which produced things that had never been seen before.
⑧疑问词是who或which,关系代词宜用that,以避免重复.
1. Which is the book that you like best?
2. Who is the man that is standing at the gate?
⑨主句是There be 结构,修饰其主句的定语从句宜用that 作关系代词. 如：
1. There is still a seat in the corner that is still free.
⑩被修饰成分为表语时,或者关系代词本身是定语从句的表语时,该关系代词宜用that .
1. That's a good book that will help you a lot.
2. My home village is no longer the place ( that ) it used to be .
定语从句中宜用which而不宜用that 的情况:
①当关系代词的前面有介词时.
1.A zoo is a park in which many kinds of animals are kept for exhibition.
2.Is this the room in which Mr. White lives?
②在非限制性定语从句中.
1.Crusoe's dog, which was are now very old, became ill and died .
2.More and more people are beginning to learn English, which is becoming very popular in our country. (which指代主句)
③在一个句子中有两个定语从句,其中一个定语从句的关系代词用了that, 另一个宜用which .
1. Let me show you the novel,that I borrowed from the library which was newly open to us.
2. At the station I bought some magazines that might help me to pass the time on the train and which I could pass on to others when I finished them.
④当关系代词后面带有插入语时.
1. Here's the English grammar which, as I have told you, will help improve your English.
⑤先行词本身是that, 宜用which .
What's that which she is looking at?
⑥先行词是those+复数名词.
A shop should keep a stock of those goods which sell best.
