原因状语从句ppt课件.pptx

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1、原因状语从句概念表示主句动作发生原因的句子Mymoyherdoesn'tgotoworkbecausesheisill.As(由于)wehavenomoney,wecan'tbuyit.Nowthat（既然）youarehere,you'dbetterstayhere.区分because，as,since,forbecause,表直接原因，语气最强，放主句前后都可，常回答why引导的问句Theywenttoschoolbybusbecauseitwascheap.since表示已知的，显然的理由或原因，意思是既然，较正式，语气比because弱Sin

2、ceyoudon'ttrusthim,youshouldnotemploy(雇佣)him.as附带说明的双方已知的原因，语气比since弱，位置灵活Asitisdark,you'dbetternotgoout.for表示不知道的原因，语气最弱，位于主句之后，对前面内容进行补充及解释说明Mr.Greenmustbeill,forheisabsent(没出席的)today.注意三个问题1，because和so不能连用，二者只能出现其一Becausesheisill，mymoyherdoesn'tgotowork.Sheisill，somymoyherdo

3、esn'tgotowork.2,because和becauseof的区别及转换because+句子becauseof+名词代词动词ingHecan'tcomebecausetheweatherisbad.Hecan'tcomebecauseofthebadweather.Ⅰ.用because或becauseof填空1.Istudyhard________Iwanttobeateacherinthefuture.2.________heistired,hedoesnotwanttogoshoppingwithus.3.Youlaughloudly_

4、_______this?4.Thematchwasputoff__________theheavyrain.5._____________thestorm,hedidn'tgothere.Ⅱ.单项选择()1—Ilikerain________itmakesmefeelcoolandrelaxed.—SodoI.A．orB.soC.butD.because()2.Ididn'taccepthishelp________Iwantedtotryitmyself.A.becauseB.thoughC.untilD.unlessDA单元语法聚焦四()3.Th

5、etrafficpolicemantookawayJim'sdriver'slicense________hebrokethetrafficrulesofdrunkdriving.A.thoughB.becauseC.tillD.and()4.Rulesarehelpfultous，________wehavetofollowthem.A.soB.butC．orD.becauseBA单元语法聚焦四()5.________heexerciseseveryday,________heisveryhealthy.A.Because;soB.Because;

6、thoughC.Because;/D.Though;/()6.Wehavetoputoff________oursportsmeeting________thebadweather.A．hold;becauseB．hold,becauseofC．holding;becauseD．holding;becauseofCD单元语法聚焦四1.Hehastogetupearly____thebadweather.A.becauseB.soC.becauseofD.asaresult2.Hedidn’tstudyhard___hefailedtheexam.A.

7、forB.asC.becauseD.so3.Theyarrived___theairportat8:00thismorning?A.atB.toC.inD.on4.MyclassmatesandIhad____funintheschooltrip.A.lotsofB.alotC.manyD.fewCDAA()7.—Whydoyoulikeyourhistoryteacher?—________heisveryfriendlyandkindtous.A．BecauseB．WhenC．ButD．What()8.Someofthestudentsarene

8、arsighted________theyspendtoomuchtimewatchingTVorplayi