含情态动词的被动语态.ppt

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1、语法学习含情态动词的被动语态含情态动词的被动语态常用的情态动词有：can,could(能；会),may;might(可以)must(必须),should(应该),would(愿意)haveto(必须；不得不),hadbetter(最好做)主动句变被动句的步骤与其它情况相同。1.WeshouldallowteenagerstowatchTVonSunday.TeenagersshouldbeallowedtowatchTVonSunday(byus).2.Mymothercancookdeliciousmeals.Deliciousmealscanb

2、ecooked(bymymother).3.Peoplemaycatchfishintheriver.Fishmaybecaughtintheriver(bypeople).4.wemustkeepteenagersawayfromtheInternet?TeenagersmustbekeptawayfromtheInternet.can/couldmustshouldmay/mighthadbetterhaveto情态动词+be+过去分词bedone结构1.Theflowers___often.A.mustbewaterB.mustbewater

3、edC.mustwateredD.mustwater2.Thebooksmay___fortwoweeks.A.bekeptB.beborrowedC.keepD.borrow3Thebrokenbike____herebyMrSmith.A.canmendB.canmendedC.canbemendD.canbemended4.Youngtreesshould________everyyear.A.beplantedB.plantedC.plantD.areplanted1.Yourhomeworkshouldbefinishedfirst.Yo

4、urhomeworkshouldn'tbefinishedfirst.Shouldyourhomeworkbefinishedfirst?2.Thismagazinecanbetakenhome.Thismagazinecan'tbetakenhome.Canthismagazinebetakenhome?3.Treesmustbewateredeveryday.Treesmustn'tbewateredeveryday.Musttreesbewateredeveryday?情态动词+not+be+过去分词can/couldmustshouldma

5、y/mighthadbetternotbedone否定式情态动词+主语+be+过去分词Can/CouldMustShouldMay+主语bedone？一般疑问式疑问词+情态动词+主语+be+过去分词can/couldmustshouldmay/might+主语bedone？疑问词特殊疑问式Whenmustthistaskbefinished?这项任务必须在什么时候完成？含情态动词的被动语态肯定句:主语+情态动词+be+动词过去分词.否定句:主语+情态动词+not+be+动词过去分词.一般疑问句:情态动词+主语+be+动词过去分词?特殊疑问句：特殊疑

6、问词+情态动词+主语+be+过去分词？4aRewritethesentencesaccordingtotheexample.1.Youmustcleanyourbedroomeveryday.Yourbedroommustbecleanedeveryday.2.Parentsshouldencourageteenagerstodosocialworkfortheircommunity.Teenagers_________________________________________________________________.3.CanLu

7、cydoherhomeworktomorrowinstead?Can______________________________________________________________________?shouldbeencouraged(bytheirparents)todosocialworkfortheircommunitythehomeworkbedone(byLucy)tomorrowinsteadn.社区，社团4.DoyouthinkwemustkeepteenagersawayfromtheInternet?Doyouthin

8、kteenagers____________________________________?5.Parentsshoul