用that不用which的情況

1.先行詞是all, many， much ,little, some, no, none，any, everything , something, anything, nothing等不定代詞或被不定代詞修飾時:

I am going to buy something that I need.

This is all that I know.

2.當先行詞被形容詞最高級修飾或先行詞本身是形容詞最高級時：

This is the best film that I have ever seen.

3.當先行詞被序數詞修飾或先行詞本身是序數詞時:

The first thing that I should do is to get tickets.

4 先行詞中既有人也有物時:

They talked about the teachers and schools that they visited.

5. 先行詞被the very, the only, the same, the last修飾時，(定高序雙特)

This is the only thing that we can do now.

6.主句是以who/which開頭的特殊疑問句時:

Which is the car that killed her?

Who is the person that is standing at the gate?

7.當先行詞是be后面的表語或關系代詞在定語從句中作表語:

He is not the man that he was.他已經不是過去的他了。

Our school is no longer the school that it used to be.

8.當主句以here ,there開頭時：

Here is the book that you have been looking for.

There is a seat in the corner that is still not taken.

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