状语从句重难点复习性讲解与练习课件

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1、Tomthoughtthiscomputerwasbroken____hislittlebrotherpointedoutthathehadforgottentoturniton.AuntilBunlessCafterDbecause2.Intimeofseriousaccidents,_____weknowsomebasicthingsaboutfirstaid,wecansavelives.AwhetherBuntilCifDunlessAC状语从句1、时间状语从句。引导时间状语从句的连词有：b

2、efore;after;when;while;as;since;until;till;theweek/year;allthetime;any/every/eachtime;thefirst/lasttime;bythetime;whenever;once…(一…就…);assoonas…;themoment/minute/instant/second/time…...;immediately/instantly/directly…;soon/shortlyafter…;nosooner+过去完成时+

3、than+一般过去时;hardly/scarcely+过去完成时+when+一般过去时;Wheneverwemetwithdifficulties,theycametohelpus.Mysistercamedirectlyshegotmymessage.EverytimeIcatchacold,Ihaveapaininmyback.ThefirsttimeIclimbedontothewall,Ifeltnervous.注意：如果把nosooner,hardly,scarcely,barely置于句

4、首，它所连带的这部分就要倒装，如：Shehadnosoonerheardthenewsthanshefainted.Nosoonerhadsheheardthenewsthanshefainted.Shehadhardlyheardthenewswhenshefainted.Hardlyhadsheheardthenewswhenshefainted.as,when,while的用法与区别：when:①表示“当…的时候”，引导的从句可表示“一段时间”也可表示“一瞬间”。（从属连词）Whentheya

5、rrived,itwasalreadymidnight.从句和主句的动作同时发生，但因为从句动作arrived是非延续性的,表示的是“一瞬间”，此时不可用while，但可用as替换。Itwasfiveo’clockwhenhelefthome.Whentheclockstruckeleven,allthelightswentout.(从句的动作在主句之前发生)Whenherantothestop,thebushadgone.(从句动作在主句动作之后发生)Hereadanewspaperwhenhew

6、aswaitingforabus.从句动作和主句动作同时发生，而且从句动作waiting是延续性的，表示的是“一段时间”，此时可用while替换。②、when=andthen,意为“这时….就在这时….”。（并列连词，连接两个分句）常用句型：was/weredoingsth.when……was/weregoingtodosthwhen…was/wereabouttodosth.when……hadjustdonesth.when……was/wereonthepointofdoingsth.when……

7、was/were+介词短语+when...例如：Iwaswanderinginthestreetwhensuddenlyadogbitme.Iwasgoingtogooutwhenamancametovisitme.=Iwasabouttogooutwhenamancametovisitme.=Iwasonthepointofgoingoutwhenamancametovisitme.IhadjustgotupwhenamancametovisitmeChuckwasonaflightacrosst

8、hePacificOceanwhensuddenlyhisplanecrashed.③可作“既然”讲，用于引出“使某人的行为看似出乎意料的情景”。Itwasfoolishofyoutotakeataxiwhenyoucouldeasilywalktherein5minutes.Whydoesshealwaysdrivetoworkwhenshecouldeasilytakethetrain?④可作“如果”讲，用于“作出某事总是正确或属实”的概括。Howcouldyou