定语从句(The Attributive Clause)
在复合句中，修饰某一名词或代词的从句叫做定语从句，如：
(1)The man who lives next to us is a policeman
(2)You must do everything that I do .
上面两句中的man和everything 是定语从句所修饰的词，叫先行词，定语从句放在先行词的后面。
引导定语从句的词有关系代词what，which，who，(宾格whom，所有格whose)和关系副词
where，when，关系代词或关系副词放在先行词和定语从句之间，起联系作用，同时又作定语从句的
一个成分。
由关系代词引导的定语从句
that在从句中作主语或宾语
指物
A plane is a machine that can fly。(作主语)
The noodles that I cooked were delicious。(作宾语)
指人
Who is the man that is reading the book over there？(作主语) The girl that we saw yesterday was Jim's sister。(作宾语)
which在从句中作主语和宾语。
指物
The silk which is produced in Hangzhou sells well。(作主语)
The song which the Beatles sang were very popular。(作宾语) who，whom在从句中分别作主语和宾语
指人
The foreigner who visit our class yesterday is form Canada。(作主语) The boy who broke the window is called Roy。(作主语)
The person to whom you just talked is Mr Li。(作宾语)
Mrs Evans is the person to whom you should write。(作宾语)
定语从句(The Attributive Clause)
在复合句中，修饰某一名词或代词的从句叫做定语从句，如：
(1)The man who lives next to us is a policeman
(2)You must do everything that I do .
上面两句中的man和everything 是定语从句所修饰的词，叫先行词，定语从句放在先行词的后面。
引导定语从句的词有关系代词what，which，who，(宾格whom，所有格whose)和关系副词
where，when，关系代词或关系副词放在先行词和定语从句之间，起联系作用，同时又作定语从句的
一个成分。
由关系代词引导的定语从句
that在从句中作主语或宾语
指物
A plane is a machine that can fly。(作主语)
The noodles that I cooked were delicious。(作宾语)
指人
Who is the man that is reading the book over there？(作主语) The girl that we saw yesterday was Jim's sister。(作宾语)
which在从句中作主语和宾语。
指物
The silk which is produced in Hangzhou sells well。(作主语)
The song which the Beatles sang were very popular。(作宾语) who，whom在从句中分别作主语和宾语
指人
The foreigner who visit our class yesterday is form Canada。(作主语) The boy who broke the window is called Roy。(作主语)
The person to whom you just talked is Mr Li。(作宾语)
Mrs Evans is the person to whom you should write。(作宾语)