定语从句中which和that有以下区别：
一：只用which,不用that的情况。
1)which可用在非限制性定语从句中。例如：
The project,which lasted four years,cost one billion dollars.这项工程历时四年，耗资十亿美元。
2)which可用前置介词宾语。例如：
This is the house in which we lived three years ago.这是我们三年前住过的那所房子。
二：只用that，不用which的情况。
1)that相当于关系副词when,where,why,in the way＝in which。例如：
I'll never forget the Monday that /when you first arrived.我将永远不会忘记你初到的那个星期一！
Do you know anywhere that I can get fruit?
你知道我能在哪里买到水果吗？
I like the place for the very reason that/why you dislike it.我喜欢那地方的原因，恰恰是你不喜欢它的原因。
He doesn't see things the way that /in which we see them.他看问题跟我们不一样。
2)that既可指物，也可指人。例如：
The people that worked on the project made a good effort.从事那项工程的人们做了很大努力。
3)当主句以here,there开头时，常用that。例如：
Here is the place that you've been looking for.这就是你一直找的地方。
4)当先行词是序数词、形容词最高级或先行词被序数词或形容词最高级修饰时，常用that。例如：
The first(thing)that should bed one is to get the book.应该做的第一件事是弄到那本书。
This is the best place that I've ever visit-ed.这是我曾参观过的最好的地方。
5)当先行词是all,anything,nothing(something除外),none,little,much时，常用that。例如：
Is this all that's left?这就是剩下的所有东西吗？
Have you got anything that belongs tome?你有没有拿过属于我的东西？
6)当先行词被no,little,only,very,the last等修饰时，常用that。例如：
The only thing that could be done is to find
our way home.唯一能做的事情就是要找到回家的路。
7)当先行词是两个或两个以上的词分别表示人和物时用that。例如：
They talked about the teachers and the schools that they knew.他们谈到了他们熟悉的老师和学校。
8)在以which，who开头的句子中常用that。例如：
Which is the car that killed the man?撞死那个男子的小车是哪一辆？
9)time是先行词时，前面如有序数词或last修饰时，定语从句只能用that引导或省略。例如：
This is the last time(that)I shall give you a letter.
The first time(that)I saw him was last year.
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