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1、As的用法小结（一）、as作连词的用法:1.作“在…期间，当…的时候”引导时间状语从句.注意与when、while的用法区别。①下列情形时,只用as,而不用when或while。1)用于表示同一个人的两种动作交替进行,指一边----一边.如:Thegirlsingsasshegoestoschool.Helookedbehindoccasionallyashewentforwardintheforest.2)表示两个同步发生的动作或行为,意思是随着…的发展.如:Astimewenton/by,shebecame
2、moreandmorebeautiful.Aschildrengetolder,theybecomemoreandmoreinterestedineverything.3)表示两个短暂行为或事情几乎同时发生.如:Iwatchedherasshereadthebook.Ithoughtofitjustasyouopenedyourmouth.Justastheflyingwormhitherface,shegavealoudcry.4)接名词表示某一个年龄段时.如:Asayoungman,hewasactivei
3、nsports.Asalittleboy(Whenhewasalittleboy)hebegantolearntoplaythepiano.②when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。如:WhenIwasatcollege,Icouldspeakseveralforeignlanguages.Whentheclockstrucktwelve,Ihadsleptfor2hours.IwaswanderingthroughthestreetwhenIcaughtsightofatail
4、or’sshop有意料之外的意思③while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时如:Workwhileyouwork.Playwhileyouplay.Strikewhiletheironishot趁着2.As=Since作"既然"、"由于"解,常用来表示已为人们所知或显而易见的原因或理由。如:Ashe’sbeenillforages,Iwillhelphim.As/Sinceyou'renotfeelingwell,youmaystayathome.Ashewasn'tready
5、,wewentwithouthim.3.As=inthewaythat作"像"、"按照……的方式"解,引导方式状语从句。如:DoasItoldyou.Remember,youmustdoeverythingasIdo.Takethemedicineasdirected.Maglevtrainsdon’tmakemuchnoise,asplanesdo.WhenatRome，doasRomansdo．入乡随俗Asinyourcountry，wegrowwheatinthenorthandriceintheSout
6、h.4.用于as---as或not/so/as----as中,前一个as是副词,后一个as是连词,引导比较状语从句。如:Theyhelpedtheoldasmuchaspossible.4Idon'tspeakEnglishso/aswellasshedoes.5.表示虽然,尽管等,引导让步状语从句,常用倒装语序,模式为:adj./adv./n.+as+主语+谓语+主句。如:Tiredastheywere,theywalkedon.Childasheis，heknowsalot．Fastasheran，hedi
7、dn'tcatchthebus．MuchasIrespecthim,Iwon’tdoassuggests.Tryasyoumay,youmightfailagainTryashemight，Tomcouldnotgetoutofthedifficulties．6.表示也------一样。Sheisadoctor,aswasherhusband.（二）、as作关系代词,引导定语从句,表示正如,这一点.如:Heisverycareful,asweallknow.Asiswell-known,Taiwanbelong
8、stoChina.另外,当先行词被thesame,such,so等词修饰时,常用as来引导定语从句。如:Suchaclevergirlasshecanlearnanythingquickly.HewishedtobesuchamanasLeiFengwas．Iwasreadingthesamebookasheboughtyesterday.ThisbookisnotsuchasIexp
