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as引导的非限制性定语从句：1：as引导限定性定语从句，常用于以下句式，其中关系代词在从句中担当主，宾，表语：①so/as/such+名词+as…像……一样的，像……之类:Wehavefoundsuchmaterialsasareusedintheirfactory.Thesehousesaresoldatsuchalowpriceaspeopleexpected.(00上海)ThisbookisnotsuchasIexpect.Suchthingsasyoudescribedarerarenow.(四校联考)Heisn’tsuchamanasyoudescribed.Heissuchalazymanasnobodywantstoworkwith(成都诊断)=heissuchalazymanthatnobodywantstoworkwithhim.Iwanttohavesuchadictionaryashehas.IhaveboughtsuchawatchaswasadvertisedonTV.MountWuyiissuchanattractiveplaceofinterestaseveryonelikestovisit.(福建质检)Suchmoneyasheearnedwasspentonspiritsandtobacco.Hewasnothalfsuchacowardaswetookhimfor.②thesame+名词+as和……同样的:Heisnotthesamemanashewas/usedtobe.Thewestisnotthesameasitwas20yearsago.Ilikethesamebookasyoudo.Ishalldoitinthesamewayasyoudid.ThisisthesamepenasIlostyesterday.Isthisthesamemosquitoasbityoujustnow?2:as引导的非限定性定语从句，指代整个主句的内容，但不同于which的是，它引导的定语从句既可以位于主句的前面，也可以位于主句的后面。它的意思是“正如”，在这些从句中as作主语或宾语。经常使用的短语又：as(it)seemslikely,as(it)oftenhappens,as(it)wasprintedout,as(it)wassaidearlier,asIremember(it),asIunderstand(it),as(it)appears,asisknown,asissaid,asisreported,asannounced,aswehadexpected,aseverybodycansee,asismentionedabove.如：Asweallknow,chinaisadevelopingcountry..(在句首只能使用as)Asisknowntoall,heisthebeststudentinourclass.Aswasexpected,hefailedintheexam.Asanybodycansee,theyweretellingalie.Thegirlmarriedarichman,asisnatural.Asisoftenthecase,mymotherhasthefinalsayintheargument.(云南诊断)______Iexplainedonthephone,yourrequestwillbeconsideredatthenextmeeting.(2005年浙江卷)A.WhenB.AfterC.AsD.Since______isreportedinthenewspapers,talksbetweenthecountriesaremakingprogress.(2004年北京卷)A.ItB.AsC.ThatD.What______isoftenthecase,wehaveworkedouttheproductionplan.(2004年江苏卷)A.WhichB.WhenC.WhatD.AsAsisknowntousall,the2008OlympicGameswilltakeplaceinBeijing.(2008福建)Asisknowntoeverybody,Taiwanisapartofchina.Wemustunifyit.Theweatherturnedouttobeverygood,whichwasmorethanwecouldexpect.(1994高考)Asisknowntoeverybody,themoontravelsroundtheearthonceeveryone.(01全国)=themoontravelsroundtheearthonceeverymonth,as/whichisknowntoeveryone.=itisknowntoeverybodythatthemoontravelsroundtheearthonceeverymonth.=whatisknowntoeverybodyisthatthemoontravelsroundtheearthonceeverymonth.Shehasbeenabsentagain,asisexpected.Jackhaswonthefirstprize,asitoftenhappens.ShehasreadwidelyinRomanticliterature,asitappearsfromheressay.Asisreportedinthenewspapers,talksbetweenthetwocountriesaremakingprogress.(04北京)Asisoftenthecase,wehaveworkedouttheproductionplan.(04江苏)（which,when,what,as）Asismentionedabove,thenumberofthestudentsinseniorhighschoolsisincreasing.(杭州测试)Awarissocruelthatisalwayscausesgreatlosses,ashashappenedinIraqandothercountries.(江西联考)Meetingmyuncleafteralltheseyearswasanunforgettablemoment,one(that)Iwillalwaystreasure.=meetingmyuncleafteralltheseyearswasanunforgettablemoment,whichIwilltreasure.(2002高考)AsIexplainedonthephone,yourrequestwillbeconsideredatthenextmeeting.(2005浙江)Soasyoucanimagine,ifyourskingetsburntItcanbeveryserious.■在as引导的从句中，后面的动词常常使用被动语态，如果从句行为动词是主动语态，一般用which引导定语从句)Tomhasmaderapidprogress,whichmakesmeveryhappy.(Acontainerweighsmoreafterairisputin,whichprovesthatairhasweight.■(当非限定定语从句为否定句时，常常用which引导)Mr.SmithusuallypraiseshisstudentRoseinpublic,whichshedoesn’tlikeatallThegentlemandidn’tgivehisseattoanoldman,whichwasnotexpected.3.as引导的限制性定语从句与其他从句的比较ThisisthesamebookasIlost.这本书和我丢的那本一模一样。(定语从句)ThisisthesamebookthatIlost.这本书就是我丢的那本。(定语从句)Thisissuchaninterestingbookaswealllike./Thisissointerestingabookaswealllike.这是大家都喜欢的如此有趣的一本书。(定语从句)Thisissuchaninterestingbookthatwealllikeit./Thisissointerestingabookthatwealllikeit.这本书如此有趣，大家都喜欢。(结果状语从句)