情态动词的被动语态

语法学习含情态动词的被动语态1.Teenagersshouldbeallowedtogoout.2.16-year-oldsshouldbeallowedtodrive.3.16-year-oldsshouldbeallowedtogettheirearspierced.4.16-year-oldsshouldbeallowedtochoosetheirownclothes.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)

can/couldmustshouldmay/mighthadbetterhaveto

情态动词+be+过去分词bedone结构情态动词+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？疑问词特殊疑问式主动句变被动句的步骤与其它情况相同。WeshouldallowteenagerstowatchTVonSunday.

TeenagersshouldbeallowedtowatchTVonSunday(byus).Peoplemaycatchfishintheriver.Fishmaybecaughtintheriver(bypeople).1.Mymother

cancookdeliciousmeals.

Deliciousmealscanbecookedbymymother.2.Students

willuse

thesetextbooksnextterm.Thesetextbooks

willbeusednextterm.3.Youshouldwater

treesoften.Treesshouldbewatered

often

.4.Youmustnotplant

treesinverydryearth.Treesmustnotbeplanted

inverydryearth.1.Icanfinishthework.Theworkcanbefinishedbyme.一般问句：

Cantheworkbefinishedbyyou?2.We

shouldplantmanymoretrees.Manymoretreesshouldbeplantedbyus.一般问句：

Shouldmanymoretreesbeplantedbyus?Teenagers

shouldbe

allowed

todrivethecar.3.Parentsshouldallowteenagerstodrivethecar.一般问句：

Shouldteenagers

be

allowed

todrivethecar?Trees

mustbewatered

everyday.4.Theymustwatertreeseveryday.一般问句：

Musttrees

bewatered

everyday?Sixteen-year-oldsshouldbeallowedtodrive.(改为否定句)Sixteen-year-oldsshouldn’tbeallowedtodrive.Ithinktheworkshouldbedoneatonce.(改为否定句)Idon’tthinktheworkshouldbedoneatonce.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.Foodsafetyisveryimportant.Morerulesshould_______inChina.AmakeBbemakingCbemade2.Teenagers______allowedtodrive.A.shouldnotbeBshouldbenotCnotshouldbe3.It'sdifficulttogettotheothersideoftheriver.ithinkabridge_____overtheriver.AshouldbebuiltBshouldbuiltCwill