as引导非限制性定语从句时与which的区别(3页).doc

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1、-as引导非限制性定语从句时与which的区别-第 3 页as引导非限制性定语从句时与which的区别1.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2.当非限制定语从句为否定时，常用which引导。3.AS可句子首或尾 which只在主句后面。4.such，same修饰先行词时关系词用as，介词后用whichas/which都可以引导非限制性定语从句。当引导词在从句中充当主语，若从句谓语动词是非be动词，只能用which.其他情况，比如引导词作主语，谓语动词是be动词，或者做宾语，或者做补语，as和which均可。he he said he was a king,

2、which/as was a lie.he said he was a king,which/as i dont believe.若果定语从句移到前面则无论什么情况都用asas i believe,.as is known to all,.as we all know,.as is reported,.as is said,.赞同2| 评论 Which as 1、语义的区别当主句和从句语义一致时，用as；He made along speech,as we expected. 当主句和从句语义转折不一致时，用which，He made along speech,which was unexpe

3、cted. 2、位置的区别看到句首一定用as，which 不可能放在句首。as we all know,as is mentioned aboveas often happensas is often the caseAs is well known3、含义的区别as有“正如”的含义，which没有此含义。As is well known，Shanghai is a big city Some of the roads were flooded， which made our journey more difficult4、否定句用which Tom drinks a lot everyday

4、,which his wife doesnt like at all.赞同52| 评论(5) 其实可以引导定语从句的远远不止这两个关系词，我多说一点吧，把关系代词都说一说关系代词，as比较特殊，先说它它和其他关系代词不一样的有以下三点：它可以代替整个句子它引导的定语从句可以放句首，而其他先行词必须放在先行词后面它一般有“正如”的意思比如：As everyone knows,the earth goes around the sun正如所有人都知道的，地球绕着太阳转。其中as指代的是后面整个主句“the earth goes around the sun”which who whom that这

5、些就是指代人或物的关系代词，用法普通，不用细讲，给几个句子体会一下（如今语法不是特别严谨了，who可以代替whom。但关系代词在从句中作主语时，whom不可以代替who）The boy who/whom she talked to was Anns friend.The park which is near my school is very beautiful.一般来说，that可以替换who whom which但是在非限定性定语从句中（如果不会判断，知道有逗号的就是非限定性定语从句就可以），必须用who whom或which不能用that代替但是在句子中有the one the most

6、 all only等具有限定性的词语时，必须用that而关系副词常用的就是when where why 这个你要是想了解，自己再查查吧有一点需要注意的是“介词+关系代词”引导时，关系代词不能用as做选择题时，还是按照语法规则去做eg：1.（ ）is known to everybody ,the moon travels round the earth once every month.月亮每月围绕地球转一周，这是人人皆知的。由于在句首，本题选 as 2.she heard a terrible noise,（ ） brought her heart into her mouth.她听到可怕地声音，这让她把心都提到嗓子眼了。 由于在句尾，填写which