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1as用法总结一、用作连词的as1.引导时间状语从句,表示“当……的时候”,其用法与when和while类似。例如:Asachild(Whenhewasachild),shewassenttosixdifferentschools.此用法中as多表示从句与主句动作同时进行,意为“一边……一边……”,一般不与状态动词连用。例如:Shesangsongsasshedidherhomework.as还可以表示一动作紧接着另一动作发生,说明另一动作的结果,有“随着……”的含义。例如:Astimewentby,wefoundhewasanhonestman./Ashegrewolder,helostinterestineverythingexceptgardening.例1Itwasn’tuntilnearlyamonthlater________Ireceivedthemanager’sreply.A.sinceB.whenC.asD.that解析:本题的as中与when一起作为干扰项,容易使考生往时间状语从句上思考,事实上本题是强调句,正确选项是D。2.引导原因状语从句,表示“由于,因为”,相当于because,但通常置于句首。例如:Asheisaqualifieddoctor,Itrusthisadviceonmedicalmatters.3.引导让步状语从句,通常可与although或though通用,但语序不同,although或though用于句首,as用于倒装结构。例如:YoungasIam,IalreadyknowwhatcareerIwanttofollow./Although(或Though)Iamyoung,IalreadyknowwhatcareerIwanttofollow.as表示让步用于倒装结构,通常将从句的表语、状语或动词前置。如果表语有冠词a/an,需去掉。2例如:Greatscholarasheis,heislackingincommonsense./MuchasIlikeyou,Icouldn’tlivewithyou./Tryashewould,hecouldn’topenthedoor.例2_____hehaslimitedtechnicalknowledge,theolderworkerhasalotofexperience.A.SinceB.UnlessC.AsD.Although解析:as虽然有引导让步状语从句用法,但本题不是倒装结构,故正确答案应是D。4.引导方式状语从句,表示“如,像”。例如:WheninRome,doasRomansdo./Dotoothersasyouwouldhaveothersdotoyou.例3Wewantedtogethomebeforedark,butitdidn’tquite________asplanned.A.makeoutB.turnoutC.goonD.comeup解析:本题考查动词词组辨析,题干中的“asplanned”给同学们提供了重要信息,答案选B。5.固定句型:“主句,as+be/do+主语”表示“也一样”。例如:She’sunusuallytall,asarebothherparents./He’sadoctor,aswashiswifebeforeshehadchildren.二、用作介词的as1.表示“如,像”。例如:Theygotunitedasoneman./Shespokeofmeasherdearestfriend.2.表示“作为、当作”。例如:AsaLeaguemember,youshouldthinkmoreofothers./Aftergraduatingfromthecollege,hefirstlyworkedasaclerkinabigcompany.3.与某些动词搭配,表示“把……当作……”,如:lookon…as…,regard…as…,treat…as…,3consider…as…,thinkof…as…,see…as…等。其中consider…as…中的as可以省略。as与famous或known搭配,表示“作为……而出名”。例4.LindaworkedfortheMinnesotaManufacturingandMiningCompany,________as3M.A.knowingB.knownC.beingknownD.tobeknown解析:如果熟悉beknownas这一短语,运用有关非谓语动词的常识,可选出正确答案B。三、用作关系代词的as1.引导限制性定语从句,先行词前通常有as,so,such,same等修饰语。例如:Hewillmarryasprettyagirlashecanfind./Myhometownisnolongerthesameasitusedtobe./Asmanypeopleasarepresentwillbegivenapresent.在此种用法中,同学们要注意与结果状语从句的区别。比如:A:Theteacheraskedussuchadifficultquestionthatnoneofuscouldanswerit.B:Theteacheraskedussuchadifficultquestionasnoneofuscouldanswer.A句为结果状语从句,而B句则是定语从句。2.引导非限制性定语从句,用来指代整个主句(即先行句),表示“这一事实,那一情况”。从句可以位于句首、句中或句末。例如:Westandwhenthenationalanthemisplayed,asisthecustom.例5______Iexplainedonthetelephone,yourrequestwillbeconsideredatthenextmeeting.A.WhenB.AfterC.AsD.Since解析:根据句意,选项C是正确答案。as表现的正是本点所讲用法。例6_______isourbeliefthatimprovementsinhealthcarewillleadtoastronger,moreprosperouseconomy.A.AsB.ThatC.ThisD.It解析:本题中的as项干扰性很强,容易误选。实际上句中that引导的应是真正的主语从句,it充当形式主语,故选D。如果将题干中的that换为逗号,则必须选as。4例7Danbyleftwordwithmysecretary________hewouldcallagainintheafternoon.A.whoB.thatC.asD.which解析:that引导的从句是word的同位语,本题应选B。as无此用法,起干扰作用。四、用作副词的as修饰形容词或副词,表示程度,【意为“同样地”。例如:Heswimsfast,butIswimjustasfast.但它通常构成表示比较的结构“as…as…”,“notas…as…”。此结构中第一个as是副词,第二个as是连词。否定结构中的副词as可以由so代替。as…aspossible/onecan也属于此用法。例如:Itisgenerallybelievedthatteachingisasmuchanartasitisascience.ThemoviewasnotasgoodasIhadexpected./Iplaytennisaswellashim.五、用在习语中的as由as构成的习语很多,常见的有:assoonas“一……就”,引导时间状语从句;as/solongas“只要”引导条件状语从句;asif/though“好像,仿佛”,引导方式状语从句或表语从句;asto/asfor“至于,就……而言”;asmuch/manyas“多达……”;as/sofaras“就……的限度”;asaresult,asaresultof“(由于……的)结果”;asamatteroffact“事实上”;aswell“也、还”;AaswellasB“不但A而且B”;asitis“照现状看,看样子”,等等。5例8Iwouldlikeajobwhichpaysmore,but______IenjoytheworkI’mdoingatthemoment.A.inotherwordsB.ontheotherhandC.foronethingD.asamatteroffact解析:选项D极具干扰意义,但进一步研读会发现本题中的两个分句表达了一件事的两个对立面,故选B。例9——Peopleshouldstopusingtheircarsandstartusingpublictransport.——______.Theroadsaretoocrowdedasitis.A.AllrightB.ExactlyC.GoaheadD.Fine解析:本题选项中虽没有as内容,但题干中的asitis却是解题的关键信息,正确选项为B。例10Maggiehasbeenfortunatetofindajobshelovesand,_____,shegetswellpaidforit.A.soonerorlaterB.what’smoreC.asaresultD.moreorless解析:本题后一个分句不表示结果,而是递进,故选B,而不是C。例11.Thewinterof1990wasextremelybad._______mostpeoplesayitwastheworstwinteroftheirlives.A.AtlastB.InfactC.InawordD.Asaresult解析:选项D.Asaresult起干扰作用,正确选项为B。
本文标题:as用法总结
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