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that, which, who(宾格whom, 所有格whose)和关系副词where, when、why* 关系词常有三个作用：1、引导定语从句 2、代替先行词 3、在定语从句中担当一个成分二、关系代词引导的定语从句* 1.who指人，在从句中做主语 The boys who are playing football are from Class One. * 2. whom指人，在定语从句中充当宾语，常可省略。The man (who/whom) you met just now is my friend.* 3. which指物，在定语从句中做主语或者宾语，做宾语时可省略(1) Football is a game which is li
