ishintheriver.Fishmaybecaughtintheriver(bypeople).4.?.can/couldmustshouldmay/mighthadbetterhaveto情态动词+be+过去分词bedone结构1.Theflowers___often.A.mustbewaterB.mustbewateredC.mustwateredD.mustwater2.Thebooksmay___fortwoweeks.A.bekeptB.beborrowedC.keepD.borrow3Thebrokenbike____herebyMrSmith.A.canmendB.canmendedC.canbemendD.canbemended4.Youngtreesshould________everyyear.A.beplanted B.planted C.plantD.areplanted1.Yourhomeworkshouldbefinishedfirst.Yourhomeworkshouldn'tbefinishedfirst.Shouldyourhomeworkbefinishedfirst?2.Thismagazinecanbetakenhome.Thismagazinecan'tbetakenhome.Canthismagazinebetakenhome?3.Treesmustbewateredeveryday.Treesmustn'tbewateredeveryday.Musttreesbewateredeveryday?情态动词+not+be+过去分词can/couldmustshouldmay/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
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