定语从句只能用that或which情况

但在下列情况中，只能用 that，不用 which：
①当先行词是 all, a lot, (a) little, few, much, none, anything, something, everything, nothing 等词时。如：
All that can be done has been done.
In this factory I saw little / much that was different from ours.
②当先行词被 all, any, no, much, little, few, every 等限定词所修饰时。如：
We heard clearly every word that he said.
③当先行词是序数词或被序数词所修饰时。如：
The first thing that should be done is to get the tickets.
When people talk about Hangzhou, the first that comes to mind is the West Lake.
④当先行词是形容词最高级或被形容词最高级所修饰，以及先行词被序数词和形容词最高级同时修饰时，如：
Is that the best that you can do?
That’s the most expensive hotel that we’ve ever stayed in.
This novel is the second best one that I have ever
⑤当先行词被 the very, the only, the next, the last等所修饰时。如：
This is the very book that I want to find.
⑥当先行词为指人和指物的两个并列名词词组时。如：
The guests spoke highly of the children and their performances that they saw at the Children’s Palace.
She described in her compositions the people and places that impressed her most.
⑦当主句是以 which 开头的特殊疑问句时。如：Which is the car that killed the boy?
介词加关系代词引导定语从句是近几年高考中
的热点，复习中需注意以下几个问题：
关系代词作介词宾语，不论是在限制性定语从句中，还是在非限制性定语从句中，当介词前置时，只能用 whom 指人，which 指物；但如果介词后置，则不受这种限制，关系代词还可以省去，特别是在口语中。如：
Do you know the boy to whom she was talking?
Do you know the boy (that) she was talking to?
The pencil (which / that) he was writing with
suddenly broke.
2. 要确认关系代词前用什么介词，需根据从句中的动词与先行词的关系来确定。所以解题时需分析从句与主句之间的关系。

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