基本信息
定语从句
一： 先行词： 被定语从句所修饰的词
二： 关系代词：用来连接定语从句，并在从句中代表先行词的代词。
先行词是物： which that
先行词是人： who that
在从句中的作用： 主语、宾语、表语
e.g. They had a radio. / It could send out messages.
They had a radio which/ that could send out message. (主语)
The girl is my best friend. / She spoke just now.
The girl who/ that spoke just now is my best friend. （主语）
He always buys some books. / He never read them.
He always buys some books (which/ that) he never read. (宾语)
注意点：
1.） 定语从句一般直接跟在先行词的后面：
e.g. The man who lives next do sells vegetables.
The man sells vegetables who lives next do. ( × )
The car which my uncle just bought was destroyed in the earthquake.
The car was destroyed in the earthquake which my uncle just bought. ( × )
2．）关系代词在从句中作宾语时可以省略：
e.g. The young man ( who ) you saw was our manager.
There is something ( that ) we must keep in mind.
3.) 关系代词在从句中作介词的宾语时，介词常可以提前，但介词提前时， 关系代词只能用which 或 whom
e.g. The man is a famous runner. / You talked to him just now.
The man to whom you talk just now is a famous runner.
The chair is made of wood. / He is sitting on it now.
