定语从句中，指物时，which和that的区别

定语从句中，指物时，which和that一般没什么区别。

有些情况下，只宜用that,而不宜用which
i. 先行词是最高级形容词或者它前面有最高级形容词的时候
This is the best that has been used against pollution.
English is the most difficult subject that you will learn during these
years.
ii. 先行词是序数词，或者它前面有一个序数词的时候
He is the last person (that) I want to see.
It is the first American movie of this kind that I’ve ever seen.
iii. 主句已有疑问词who或者which的时候
Which is the bike that you lost?
Who is the woman that was praixed at the meeting?
iv. 先行词既有人又有物，宜用that
Do you know the things and persons that they are talking about?
The bike and its rider that had run over an old man were taken to the police
station.
v. 先行词是all, much, little, something, everything, anything, nothing,
none, the one等不定代词时
You should hand in all that you have.
We haven’t got much that we can offer you.
I mean the one that you talked about just now.
vi. 先行词前面Only, any, few, little, no, all, one of, the same, the very 等
词修饰的时候
The only thing that we can do is to give you some money.
Li Ming is the only one that wants to be a teacher.
Li Ming is one of the students that want to be teachers in our class.
vii. 有两个定语从句，其中一个关系代词已用which, 另外一个宜用that.
Edison built up a factory which produced things that had never been seen
before.


在限定性定语从句中which和that在指代物的时候常常可以通用，但是有时只宜用which
而不用that
i. 关系代词前面有介词的时候
This is the hotel in which you will stay.
ii. 如果有两个定语从句，其中的一句的关系词是that, 另一句宜用which.
Let me show you the novel that I borrowed from the library which was newly
open to us.