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1、1、从句位置不同 as:句首、中、后 which：主句或先行词之后，不位于句首 1)She told me she won the match,which was a lie.2)As is known to all,fish cant live without water.3)Air,as we know,is gas.4)He was a doctor,as I knew from his manner.,一、as和which引导非限定性定语从句的区别,2、所指不同,as:指代整个主句which：指代整个主句，主句中的某个单词1)Mike,as we expected,attended t
2、he meeting.2)Beijing,which he was born in,is our capital.,3、as，which引导的从句中谓语动词不同,as:系动词（系表结构或被动语态）which：系动词，行为动词1)He didnt say anything at the meeting,as/which was(seemed)very strange.2)He saw the girl,which made him happy.,4、as引导的定语从句表示正如.那样，固定搭配：,as is often the case as has been said beforeas is m
3、entioned above as was expected as we can see as we all knowas often happens as might be imagined Kate was late for school,as often happened.正如那样,5、as引导的从句语义与主句一致,which无此限制,She has married again,which/as was expected.She has married again,which was unexpected.,先行词前有the same,such,as,so修饰1)There are as
4、 many dictionary as are needed.2)Such women as knew Tom thought he was charming.3)He is not so kind a man as I expected.4)We are facing the same problems as we did years ago.,二、as引导的限定性定语从句,注意区别：,the same.as 相同物体the same.that 同一物体She wore the same dress as her younger sister wore.She wore the same d
5、ress that she wore at Marys wedding.such/soas 定语从句，as 作主语，宾语such/so that 结果状语从句，that不做成分He lifted so heavy a stone as no one else can lift.He is so young a boy that he cant go to school.,（2015 江苏）The number of smokers,is reported,has dropped by 17 percent in just one year.A.it B.which c.what D.as 句意
6、：正如所报道的那样，吸烟的人数仅在一年内就已经减少了百分之十七。as 有正如.那样的意思。,高考题：,（2013,山东）Youll find taxis waiting at the bus station you can hire to reach your host family.A.which B.where C.when D.as 句意：你会发现出租车在车站等候，你可以租一辆到你的寄宿家庭。本题考查限制性定语从句 as 引导限定性定语从句，先行词的前面常有the same,such,as,so修饰,总结：,1、位置不同 2、所指不同非限定性定语从句 3、从句中谓语动词不同 4、as表示正如那样 固定搭配 5、语义与主句是否一致限定性定语从句 the same/such/as/so as,
