定语从句
一．概念
在复合句中，修饰某一名词或代词的从句叫做定语从句。
先行词：被修饰的名词、代词等叫先行词。
关系词：引导定语从句的词叫关系词(关系代词、关系副词)。 ↓↘
先行词关系词
二．只用that的情况：代序高特双
代序高：先行词为不定代词，先行词被序数词以及形容词最高级修饰
特：先行词被the only ,the very, the last 等修饰时。先行词被all, any, every, each, much, little, no, some, few等修饰时
双：先行词即有人又有物时
例：1. He told me everything that he knows.
2. All the books that you offered has been given out.
3. This is the best film that I have ever read.
4. We talked about the persons and things that we remembered.
1. He is the only man that I want to see.
三．用which 不宜用that的情况
（1）关系代词前有介词且指物或事时。
The house in which I used to live has become a clothes shop. The pen with which you are writing is Jeff’s.
（2）先行词本身就是that时.
What’s that which flashed in the sky just now?
I don’t like that which he did.
四．只用who的情况：
（1）当先行词是anyone, those, one或ones时。
Anyone who does that must be mad.
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