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1、定语从句1.as的用法:(as引导定语从句,在定语从句中作主语、宾语、表语)①如为限制性的，多用于thesame…as;thesameas；such…as…;asmany/muchas；so…as等结构中。如：※Ihavethesamebookasyou(have).我有一本和你的一样的书。Herattitudetohimwasquitethesameasithadalwaysbeen.(关系代词as和指示代词same连用,在从句中用作表语,先行词是same.)②如为非限制性的，多单独引导一个定
2、语从句，这种定语从句可置于句首，句中或句尾，译为"正如，这一点"。（动词常为know,see,expect,pointout,etc.）Asweallknow,smokingisharmfultoone'shealth.(as作宾语)=Asisknowntoall,smokingisharmfultoone'shealth.（as作主语）=It'sknowntoallthatsmokingisharmfultoone'shealth.PS：thesame….as与thesame….that的异同
3、Eg：thisisthesametoolasIusedlasttime.(和…..同一类)ThisisthesametoolthatIusedlasttime（和…..同一个）●as&which:as&which引导非限制性定语从句的区别：①位置的不同：which引导的定语从句只置于所限制的句子后；as位置较灵活，也就是说as可置于所限制的句子前面；插在句子中或放在句子后。如：1.Hewaslateagain,whichmadehisteacherveryangry.2.Jack,asyoukn
4、ow,isanhonestman.或Jackisanhonestman,asyouknow.或Asyouknow,Jackisanhonestman.②先行词的不同：as引导非限制性定语从句时，其先行词多为一个句子；which引导非限制性定语从句时，其先行词可以是一个词，一个短语或一个句子。Hewasproud,whichhisbrotherneverwas.（先行词是一个词）Shewasverypatienttowardsthechildren,whichherhusbandseldomwas
5、.Hewasproud,whichIdislikeverymuch.（先行词是一个句子）Heisanhonestman,asisknowntoall.Hewasaforeigner,asIknowfromhisaccent.③as一般译为"正如""就像"，"这一点"which没有这个意思asweallknow；asyouknow;asisknowntoall;asyousee;aswecansee;ashasbeenexpected;aswehaveimagined.PS:当主句和从句之间存在着
6、逻辑上的因果关系时，关系词往往只用which。如：Tom was late for school again and again, which made his teacher very angry. 汤姆老是迟到，这使得老师很恼火。These tables are made of metal, which made them very heavy. 这些桌子是金属的，这使得这些桌子很重。8 当先行词受such, the same 修饰时，关系词常用as。 如：I’ve never hear
7、d such stories as he tells. 我从未听过象他讲的这样的故事。He is not such a fool as he looks. 他可不象他看上去的那样傻。This is the same dictionary as I lost last week. 这部词典跟我上星期丢失的一样典型例题 1）Alicereceivedaninvitationfromherboss,___cameasasurprise.A.it B.that C.which D.he 2）Th
8、eweatherturnedouttobeverygood,___wasmorethanwecouldexpect.A.what B.which C.that D.it 3）Itrainedhardyesterday,____preventedmefromgoingtothepark..A.that B.which C.as D.it （1）as引导的定语从句可置于句首，而which不可。（2）as代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词
