定语从句that与which 区别是什么?
that与which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：
The current, which is very rapid, makes the river dangerous. 水流湍急，使这条河很危险。
He has to work on Sundays, which he doesn’t like. 他得在星期天工作，他是不喜欢这样的。
The London team, which played so well last season, has done badly this season. 伦敦队上一个季度打得很好，这个季度却打得很差。
2. 直接放在介词后作宾语时，通常要用which：
She may be late, in which case we ought to wait for her. 她可能晚到，那样我们就要等等她。
The documents for which they were searching have been recovered. 他们找寻的文件已找到了。
This morning some port wine came, for which I have to thank you. 今天早上送来一些波尔图葡萄酒，为此我得向你道谢。
注：有时“介词+which”引导的定语从句可以转换成“介词+which+不定式”结构：
He had only the long nights in which he could study. =He had only the long nights in which to study. 他只有漫漫长夜可用来学习。
He had a couple of revolvers with which he could defend himself.= He had a couple of revolvers with which to defend himself. 他只有一两把手枪用来自卫。
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：
All that she lacked was training. 她缺的只是训练。
Have you everything that you need? 你需要的东西都有了吗?
The sleeping man’s subconscious mind retained everything that was said around him. 这位酣睡的人头脑的下意识能记住他周围的人说的话。
She would never do anything that was not approved of by her parents. 她父母不赞同的事她绝不会做。
4. 当先行词有the very, the only, the same 等修饰时，通常用that：
This is the only example that I know. 我知道的例子只有这一个。
Those are the very words that he used. 那是他的原话。
5. 当先行词有形容词最高级或序数词(包括last, next等)等修饰时，通常用that：
This is the best dictionary that I’ve ever used. 这是我用过的最好的词典。
The first thing that you should do is to work out a plan. 你应该做的第一件事是订个计划。
6. 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。
7. 当先行词是一个既指人又指物的并列词组时，通常用that：
They talked about the persons and things that most impressed them. 他们谈论了使他们印象最深的人和事。
8. 当要避免重复时：
Which is the course that we are to take? 我们选哪门课程？
1、That和which定语从句的不同
that用作关系代词时在下列情况下可以省略，引导限制性定语从句在从句中用作宾语时，用在there be结构前作主语时，用作表语时，在定语从句与先行词之间有插入语时。which用作关系代词，可引导限制性定语从句或非限制性定语从句，引导非限制性定语从句时which可以用整个主句作为其前行词，相当于and that，有时还可引导不定式短语从句。
2、用which不用that的情况
非限制性定语从句用which，不用that引导。先行词为that时，为了避免重复，定语从句用which不用that引导。介词后用which不用that引导。
3、用that不用which的情况
先行词前有形容词最高级或序数词修饰时，用that不用which引导。先行词为little，much，all，none，few，（the）one，something，everything，nothing，anything等不定代词时，用that引导。先行词既有指人的名词又有指物的名词时，用that引导。先行词前有any，all，no，few，every，some，little，much，（the）very，（the）only，（the）last等词修饰时，用that引导。先行词为which时，为了避免重复，用that引导。先行词在从句中作表语时，常用that引导。当主句是There be句型时，用that引导。
which 引导定语从句时,先行词是物,在从句中可做主语、宾语、表语
that 引导定语从句时,先行词既可以是人,也可以是物,在从句中也可做主语、宾语、表语
关于which和that的常考点：
一、在限制性定语从句中,只能用that不能用which的情况：
1）当先行词是指物的不定代词
例：Do you have anything that you want to say for yourself?
2）当先行词前面有下列词修饰时：the only,the very,just,any,every,some等
例：This is the very busy that I’m waiting for.
3）当先行词是形容词的最高级或先行词的前面有形容词最高级修饰时
例子：This is the best that has been used against pollution.
4）当先行词是序数词或前面有序数词修饰时
例：The train is the last that will go to Suzhou.
5）当先行词既有人,又有物
例：Do you know the things and persons that they are talking about?
6）当主句的主语是疑问词 who 或 which 时
例：which is the bike that you lost?Who is the boy that won the gold medal?
7）主句是there be句型且关系词在从句中作主语时
例：there is a seat in the corner that is still available.
二、当先行词指物,定语从句中只能用which不用that的情况：
1）在非限制性定语从句中,只能用 which
2）当动词短语中的介词提前时,只能用 which
3）先行词后面有插入语时,只能用which.
例：Here is the English grammar book which,as I’ve told you,will help you improve your English.
4）先行词本身就是that时
例：What’s that which flashed in the sky just now?
定语从句that与which的区别：
前面有介词只能用which。
以下情况能用that：
- 先行词前面有形容词最高级，序数词等修饰时。
- 先行词前有all,any,much,little,none,every,few等词修饰时。
- 先行词前有theonly,thevery,thelast,thesame等词修饰时。
- 先行词是不定代词something,anything,nothing,everything时。
- 先行词同时包括人和物时。
that既可指人又可指物,而which则一般指物.区别如下：
一、以下情况不能用that,只能用which：
1、在非限定性定语从句中,逗号之后不能用that；
2、介词后面不能用that.
3、当主句中的主语被that修饰时。That cat which I found in the street belongs to Jane
二、以下情况不能用which,只能用that
1、前面的先行词是不定代词时,如 all ,anything ,nothing,the one 等；
2、如果先行词出现了the only ,the very 时；This is the very book that I lost yesterday.
3、如果先行词出现了序数词和形容词最高级时；
4、如果先行词中既有人又有物时,如：They are talking about the school and the teachers that they visited yesterday.
5、在there be句型中,只用that
6、如有两个定语从句,其中一个已用which引导,另一个宜用that .Johnson built up a factory which produced things that had never been seen before.
7、主句是以which或who开头的特殊疑问句时Who is the woman that was praised at the meeting.
8、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。
9、当先行词被all, any, some, no, not, every, each等修饰时。
1、指代不同：在定语从句中，that指代的是人或物的先行词；而which指代的是物的先行词。
2、用法不同：在定语从句中，that不可以引导有逗号的从句；而which可以引导有逗号的从句。
3、介词不同：在定语从句中，that不可以用在介词后面；而which可以用在介词后面，常用的介词有很多，比如：of、in、from等
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