*KeytoExercises*Unit11AdverbialClause(状语从句)*状语从句0概述：在句子中起状语作用的从句就作状语从句。状语从句包括时间状语从句、地点状语从句、原因状语从句、条件状语从句、让步状语从句、方式状语从句、比较状语从句、目的状语从句和结果状语从句9种，不同的状语从句要求由不同的从属连词或相当于从属连词的词组引导。*时间状语从句11.时间状语从句可以连接时间状语从句的从属连词：after,before,when,while,as,assoonas,since,bythetime(that),once,whenever,everytime(that),thefirsttime(that),thelasttime(that),until,till,themoment,directly,immediately等。Whenhecamein,Iwaslisteningtotheradio.Beforeyoucrosstheroad,youmustlookaround.Wewillwaituntiltheteachercomesback.*时间状语从句11.1区别when/while/asWhenshepressedthebuttonthemachinestopped.WhileIwasfumblingaboutinmypocketsforsomemoney,myfriendpaidthebill.Astimepassed,thingsseemedtogetworse.when可指一段时间，也可指某个时间点；while仅可指一段时间；as主要指一段时间，和when一样，也可以指某个时间点。*时间状语从句11.2区别before/after/assoonasBeforewehavethoughtitover,wewilltakenosteps.AfterWorldWarIIthecountriesinAsiadevelopedveryquickly.Assoonaswegothome,itbegantosnow.1.3区别until/till/sinceIdidntleavetillshecameback.UntilyoutoldmeIhadnoideawhathesaid.Sincehewasfiredfromhisjob,Jackhaslostallofhisconfidence.句首只能用until,在否定句中表示“直到……才”，主句通常用表示瞬间性动作的动词，这时till和until才可以用before来替换。*时间状语从句11.4nosooner…than/hardly…when/scarcely…whenHehadnosoonersmokedthecigarettethanhebegantofeelsleepy.Ihadhardlyclosedthedoorwhensomeonestartedknockingatit.Wehadscarcelysetoutwhenitstartedtorain.此类结构中，主句经常用过去完成时。*地点状语从句22.地点状语从句2.1区别where/whereverHeliveswheretheclimateismild.(在······地方)Thecollegegraduateswentwherevertheycouldfindwell-paidjobs.(在任何地方)*原因状语从句33.1区别because/as/since/for3.原因状语从句Youhavetolearnhowtosaynobecauseyoucantbeeverythingtoeverybody.AsPeterisnotfullyprepared,wehavetosparehimtheope