定语从句总结 先行词为人时： 关系代词 从句中缺主语时，who；that；不能省略 从句缺宾语，who; that ;whom，可省略； （介词后只能跟 whom） 从句缺定语 指代’s ，whose 先行词为物时： 关系代词 从句缺主语时， which；that；不能省略 从句缺宾语时，which；that；可省略； （介词后只能跟 which） 从句缺定语 指代’s，whos
e 先行词为时间： 从句缺时间状语时，关系副词 when(也可 prep+which) 从句缺主语宾语时，which；that 先行词为地点：从句缺地点状语时，关系副词 where(也可 prep+which) 从句缺主语宾语时，which； that 先行词为 reason：从句缺原因状语时，why / for which 从句缺主语宾语时，which；that
非限制性定语从句 (带,的定语从句 ) 1. As we know, smoking is harmful to one's health.
It rained hard yesterday, which prevented me from going to the park．
(which 指代前面这个事) 3. He keeps a diary, which everybody knows. (which 指代 know 的宾语) (1) as 引导的定语从句可置于句首, which 不可。 (2)as 常带有“正如”的意思 As we know , smoking is harmful to one's health. As is known , smoking is harmful to one's health. It is known that smoking is harmful. (主语从句) (3)the same… as；such…as 中的 as 是固定结构, I have got into the same trouble as he (has).
特别说明： 1 常考名词的定语从句：case，point， stage，situation；定语从句中主语 宾语齐全用 where；定语从句中缺 主语宾语用 which 或 that 2 way 做先行词，定语从句中的 关系词用 that; in which;不填 3 用逗号隔开，起补充说明作用的
非限制限制性定语从句，无论 先行词是什么，都不用 that 4 众所周知： As is known(to all)，… It is known (to all)that 5 正如 As was reported, (It was reported that) As was announced, As was expected, As we planned, As can be seen,
只能用 that, 不能用 which 引导定语从句的情况 a)不定代词，如：anything, nothing, everything, all, much, few, any, little 等作先行词时 Finally, the thief handed everything that he had stolen to the police. b) the only, the very, the just 修饰 先行词时 He is the very man that helped the girl out of the water. c)先行词为序数词(the first, the last)
数词、形容词最高级时 The first English book that he Had read was "Gone with the wind" d)先行词既有人，又有物时 He talked about the teachers and schools that he visited. e)关系代词在从句中做表语 He is not the man that he used to be.