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定语从句（The Attributive Clause）
在复合句中修饰名词或代词的从句叫做定语从句。
I love singers who write their own music.
先行词
关系词
定语从句
I like music that I can dance to.
Attributive clause
定语从句所修饰的词 叫先行词。 定语从句放在先行词后面。
定语从句分为限定性定语从句和非限定性定语从句。本节课我们只
介绍限定性定语从句。引导定语从句的词有关系代词that、which、
who、 whom、 whose和关系副词where 、when，关系代词和关系副词是引导词， 在定语从句中担当某一成份。
关系代词和关系副词的作用
1.先行词指物时， 关系代词用that 或which
（在句中作主语或宾语）。
如：China is a country which / that has a
large population.
The computer game which/ that he is
playing is his favorite.
2.先行词指人时， 关系代词用（who）作主语或宾语，whom (作宾语)，whose (作定语)，that (作主语或宾语)。 如：
The man who is mending the machine has been retired.
This is the policeman who/ whom they were talking about yesterday.
I like the girl whose mother is an actor.
The girl with whom I went to the movie is Mary.
注意：下列情况下关系代词只用that 而不用which 或 who。
1.先行词是指物的不代词，如：all, little, few, much, none, anything, nothing, everything等时。
如：I didn't understand the words all that he said.
?2．先行词由最高级、序数词以及any, very, only, all, no, just 等所修饰。如：This is the most beautiful place that I have been to .
3.先行词既包括人，也包括物。如：They always like to talk about the man and the things that they see on the road.
4.当主句是以which 或who 开头的特殊疑问句时。如：Who is the man that opened up the lab.