定语从句之as的用法课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,关系代词 as 的用法,(1)as引导限制性定语从句通常用于thesameas/the same as,和一样；suchas像之类;的结构中,e.g.Dont trust,such,men,as,praise you to your face.(as作主语),不要相信那种当面吹捧你的人。,注意,：the samethat和the sameas的区别,e.g.This is the same book,as,I bought yesterday.,这本书跟我昨天买的一样.,This is the same book,that,I bought yesterday.,这就是我昨天买的那本书.,区别：,the sameas 指的是同类事物，而the samethat指的是同一事物。,(2),as可引导非限制性从句,，可放在主句之前，也可以放在主句之后，修饰整个句子。,通常用下列句型：asisknowntoall,asissaid,asisreported,asisannounced,asweallknow,asIexpect等,e.g.As I expected,he got the first place again in this mid-term examination.,正如我所预料的那样，他在这次期中考试中又获得了第一名。,3）as引导非限制性定语从句时与which的区别,.,a.当主句和从句语义一致时，用as;反之，用which来引导非限制性定语从句。,He made a long speech,as we expected.,He made a long speech,which was unexpected.,b.当非限制性定语从句为否定句时，常用which引导。,Tom drinks a lot every day,which his wife doesnt like at all.,