定语从句中什么情况下关系代词必须用that?

RT,3Q

①先行词为不定代词all, anything, nothing, ...；

②先行词有最高级修饰，有序数词修饰；

③先行词有only, very, any等词修饰；

④先行词既有人又有物时。

1)　在there be 句型中，只用that，不用which。

eg. There is still a seat in the corner that is still free. 2)　在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，

只用that，不用which。

eg: All that is needed is a supply of oil. 所需的只是供油问题。

Finally, the thief handed everything that he had stolen to the police.　 　　3)　先行词有the only, the very, any, few , little, no , all 修饰时，只用that。

eg: This is the very book that I’m looking for.

The only thing that we can do is to give you some money. 　　4)　先行词为最高级时或它的前面有形容词最高级时，只用that。.

eg: This is the best that has been used against pollution.

This is the most interesting film that I’ve ever seen/

5) 当先行词是序数词或它前面有一个序数词时。

eg: This train is the last that will go to Suzhou. 　　6)　先行词既有人，又有物时。

eg: Do you know the things and persons that they are talking about?

7）当先行词前面有等疑问代词who, which时，用that.

eg: Who is the man that is standing by the door?

Which is the dictionary that you want?

8) 做表语时常用that

eg: He is not that man that he was.

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