一、定义
1.在主从复合句中，对某一名词或代词起修饰作用的从句叫定语从句。被修饰的名词或代词叫先行词，引导定语从句的词叫关系词。
2.关系词分为关系代词(that，which，who，whom，whose，as等)和关系副词(when，where，why等)两类。
二、关系代词引导的定语从句
1.who引导的定语从句
[合作探究]
The children who were injured in the car accident are being treated in the hospital now.目前，在车祸中受伤的孩子们正在医院接受治疗。
Danny was the man who we rescued from the ruins.
丹尼是我们从废墟中救出来的那个人。
[自主发现1] who指人，在定语从句中可以充当主语、宾语。
2.whom引导的定语从句
[合作探究]
Rose is the person (who/whom) you should care about.
罗丝是你应该关心的人。
The boy(whom) the teacher often praises is their monitor.
老师经常表扬的那个男孩是他们的班长。
[自主发现2] whom指人，在定语从句中作宾语，可省略，也可用who代替。
