语法专题八状语从句状语从句在句中作状语，修饰主句中的动词、形容词或副词等。状语从句放在主句之前时，常用逗号分开；放在主句之后时，一般不用逗号。状语从句按其意义和作用可分为时间、条件、原因、让步、目的、结果、方式、比较、地点等9种。1．时间状语从句(1)时间状语从句常用的连词有when,as,while,before,after,since,till(until),assoonas,hardly...when...,nosooner...than,themoment等。(2)时间状语从句一般不用将来时，因此，主句若为将来时，时间状语从句要用一般现在时。(3)连词when,while,as“……”都表示当的时候，但是when引导的从句的动作和主句的动作可以同时发生，也可以先后发生；用as,while时则强调主句和从句的动作同时发生。(4)till(until)“……”表示一直到时，主句和从句都用“…………”肯定式；表示直到才时，主句用否定式，从句用肯定式。(5)assoonas和themoment“……引导的从句表示一……”就；用nosooner...than和hardly...when引导的从句“…………”表示一就。主句中的动词一般用过去完成时，从句用过去时；而且主句一般倒装，把助动词had提到前面。2．原因状语从句原因状语从句常用because,since和as引导。3．地点状语从句地点状语从句常用where,wherever等连词引导，注意不要和where引导的定语从句相混淆。4．条件状语从句条件状语从句用if,unless(if...not),as(so)longas(只要)等词引导，如果主句是将来时，条件状语从句用一般现在时表示。如：As_long_asIlive,Ishallworkhard.5．让步状语从句让步状语从句由although(though),as,evenif,however,whatever,nomatterwho(how...)等词引导。如：Cleverasheis,hedoesn’tstudywell.注意：由as引导的让步状语从句，须将作表语的形容词或名词(名词前不用冠词)放在句首。6．结果状语从句结果状语从句一般由so,sothat,so...that,such...that引导，放在主句之后。7．目的状语从句目的状语从句常由so...that,sothat,inorderthat等引导，放在主句之后。8．方式状语从句方式状语从句放在主句之后，用as,justas,asif,asthough等引导。asif和asthough引导的从句一般用虚拟语气。但如果从句中所陈述的情况很可能实现，也可用陈述语气。9．比较状语从句比较状语从句常由as...as,than,notso...as...,themore...themore...等词引导。比较从句部分常是省略句。如：Iknowyoubetterthanhedoes.1.(2009·重庆)Peterwassoexcited______hereceivedaninvitationfromhisfriendtovisitChongqing.A.whereB.thatC.whyD.when2．(2009·四川)Owenwouldn’teatanything______hecookedithimself.A.untilB.sinceC.unlessD.while3．(2009·浙江)Themedicineworksmoreeffectively______youdrinksomehotwateraftertakingit.A.asB.untilC.althoughD.if4．(2009·江苏)______unemploymentandcrimearehigh,itcanbeassumedthatthelatterisduetotheformer.A.BeforeB.WhereC.UnlessD.Until5．(2009·天津)ItraveltotheBinhaiNewAreabylightrailwayeveryday,______domanybusinessmenwholiveindowntownTianjin.A.asB.whichC.whenD.though6．(2009·山东)Thelittlegirlwhogotlostdecidedtoremain______shewasandwaitforhermother.A.whereB.whatC.howD.who7．(2009·成都毕业班诊断)Itmatterslittlewhodoesit______itisdone,foryousee,weareshortofhandsnow.A.aslongasB.asfarasC.asearlyasD.assoonas8．(2009·皖南八校联考)—Didyoutellhimthatwe’veputoffthemeeting?—No.Herushedout______Icouldsayanything.A.incaseB.afterC.beforeD.unless9．(2009·南京调研)Weneedtothinkoutsideofbox______wearetocomeupwithsomethingreallynew.A.sothatB.aslongasC.onceD.if10．(2009·南通调研)—Wasitthere______youwereawaytoanswerthephone?—Thereisnodoubtaboutit.A.thatB.whichC.whileD.where11．(2009·宁波教学检测)Mostbirdsfinditsafetosleepinthetrees,so______theyhaveeggsoryoungchicks,theydon’tuseanest.A.whyB.howC.whereD.unless12．(2009·宁波教学检测)Iwon’tgiveyousuchhelp______youtellmethetruth.It’sbeyondmyabili...
