1. 定义： 在主从复合句中作定语的从句称之为定语从句。定语从句常常放在所修饰的名词或代词后面。被修饰的名词或代词叫做先行词。2. 关系词：2.1 作用 引导从句，作为从句开始的标志； 代替先行词； 在从句中充当一定成分。2.2 分类 关系代词： who, whom, whose, that, which, as 关系副词： when, where, why定语从句中的关系词没有疑问意义；What 不能用来引导定语从句！Who: 指“人”，在定语从句中做主语或宾语Eg: The man who is sitting there is my brother.Whom: 指“人”，在定语从句中做宾语Eg: The girl whom he is speaking to is my sister. The girl to ____ he is speaking is my sister.Whose: 指“人的”或“物的”，在定语从句中做定 语，其后必须有名词存在。Eg: The girl whose hair is red is my sister. The room whose window faces south is mine.=?The man, for____ life is difficult, is very kind. A. whom B. whose C. who Which: 指“物”，在定语从句中作主语或宾语Eg: The book which is on the table is mine. The book about which you talked is cheap. He failed again, which made me unhappy.That: 指人或物，在定语从句中作主语、宾语或表语Eg: All that glitters is not gold. I am no longer the person that I used to be. As: 指人或物，在定语从句中作主语或宾语，常 与 the same 或 such 连用，常译成“正如”Eg: I’m using the same dictionary as he used. Keep away from such things as will do you harm. As we all know, English is an international language. As is said above, as is mentioned above, as is often the case (with…), ( 对… ) 这是常有的事 as is reported,As everybody knows,When: 指“时间”，在定语从句中作时间状语，用 在表示时间的词后面。Eg: That happened on the day when I saw you.where: 指“地点”，在定语从句中作地点状语，用 在表示地点的词后面。Eg: This is the place where I stayed years ago.Why: 指“原因”，在定语从句中作原因状语，多放在 the reason 后面。Eg: This is the reason why he was late.1.H...
