关系代词AS的用法

关系代词AS的用法AS作关系代词,用来引导定语从句:限制性定语从句和限非制性定语从句一、AS引导限制性定语从句AS引导限制性定语从句时,通常和such,thesame,as(so)等连用,构成such...as/suchas,thesame...as/thesameas,as(so)...as等结构,在从句中可作主语,宾语和表语。1.such...as/suchas意为“...的那种...,像那样的”，such...as/suchas引导限制性定语从句时,既可指人,也可指物。such用于名词之前时,具有形容词性质；such单独使用(即后面不接名词)时,具有代词性质。Don’ttrustsuchmenaspraiseyoutoyourface.(as作主语)不要相信那种当面吹捧你的人。Youshouldreadonlysuchbooksasyoucanunderstandwithoutmuchdifficulty.(as作宾语)你应当只读那些你读起来不太难懂的书。Associatewithsuchaswillimproveyourmanners.(as作主语)要和能改善你的言行的那种人结交。2.thesame...as/thesameas意为“与...同样的”,和such一样,thesame既有形容词作用,又有代词性质。Wehavearrivedatthesameconclusoinastheyhave.(as作宾语)我们已得出和他们同样的结论。比较:thesame...as和thesame...that不同,前者是“同那一个相似”,后者是“正是那一个”。如：ThisisthesamewatchasIlost.这同我丢的那块表一样。ThisisthesamewatchthatIlost这正是我丢的那块表。3.as(so)...as意为“和...一样”,后接由many,much等修饰的名词或由形容词修饰的单数名词,注意其语序为as(so)+adj.+a+n+as,如：It’saspleasantafilmasIhaveeverseen.这是一部和我以往看的同样好的电影。Asmanysoldiersasmarchedwerekilled.很多游行的战士都被杀了。注意:such...as与such...that,so...as与so...that的区别:that是连词,引出结果状语从句,在从句部分不作成分;as是关系代词,引出定语从句,在从句中可作主语,宾语和表语。比较:Heissuchaniceboythateveryonelikeshim.Heissuchaniceboyaseveryonelikes.Itissodifficultaproblemthatnobodycanworkitout.Itissodifficultaproblemasnobodycanworkout.二、AS引导非限制性定语从句AS引导非限制性定语从句时,通常指的不是主句中的某一个名词(先行词),而是指整个主句表达的内容,对主句所作的陈述进行附加说明,意为“这...,如...或正如...”。这种从句可位于主句之前,之中或之后。Asweallknow,TaiwanbelongstoChina.Taiwan,asweallknow,belongstoChina.TaiwanbelongstoChina,asweallknow.注意下面的习惯用法:asiswelldiscussed正如已讨论过的asisoftensaid正如通常所说asisoftenthecase通常就是这样ashasbeenpointed正如所指出的那样ashasbeensaidbefore如上所述asoftenhappens如同经常所发生的那样asmightbeexpected正如所料asiswellknowntoall众所周知在多数情况下,从句中的谓语助动词可以省略asexplainedbefore如前面所解释的asmentionedabove如前面所提到的asshowninthefigure如图所示asseenfromthetable从表中可以看出asalreadydiscussed正如已讨论过的高考题精选：1.______isknowntoall,Chinawillbeanandpowerfulcountryin20or30years’time.(1994上海)A.That；advancingB.This；advancedC.As；advancedD.It；advancing2.______ismentionedabove,thenumberofthestudentsinseniorhighschoolsisincreasing.(1999上海)A.ItB.AsC.ThatD.Which3.Thesehousesaresoldatsuchalowprice________peopleexpected.A.likeB.asC.thatD.which4.________isknowntoeverybody,themoontravelsroundtheearthonceeverymonth.(2001NMET)A.ItB.AsC.ThatD.What5.Thereatthedoorstoodagirlaboutthesameheight__________.(2004北京春)A.asmeB.asmineC.withmineD.withme6.__________isreportedinthenewspapers,talksbetweenthetwocountriesaremakingprogress.(2004北京)A.ItB.AsC.ThatD.What7._________isoftenthecase,wehaveworkedouttheproductionplan.(2004江苏)A.WhichB.WhenC.WhatD.As8._______Iexplainedonthephone,yourrequestwillbeconsideredatthenextmeeting.A.WhenB.AfterC.AsD.Since9.TheBeatles,_________manyofyouareoldenoughtoremember,camefromLiverpool.A.whatB.thatC.howD.asKeys:CBBBABDCD