情态动词及情态动词的被动语态

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1、含情态动词的被动语态2情态动词有哪些?can/may/must/will/shall/should/oughttoneed/darehadbetter/wouldrather,usedto/haveto/beableto3情态动词的含义序号原形过去式主要含义1cancould2maymight3mustmusthadto4needneeded5daredared6willwould7shallshould1.能力2.请求/准许3.可能性1.请求/准许2.可能性*3.祝愿1.义务(必须);2.猜测(肯定)需要敢愿意1.征求意见2“应该”(should)4序号原形过去式主要用法8

2、beabletowas/wereableto9havetohadto10oughttooughtto11usedto12hadbetter13wouldrather“能够”（能力）“不得不/必须”“应该”“过去（常常）”“最好”“宁愿”情态动词的含义can/couldbedonemustbedoneshouldbedonemay/mightbedonehadbetterbedonehavetobedone含情态动词的被动语态：情态动词+be+PP否定式：情态动词+not+be+p.pcan/couldnotbedonemustnotbedoneshouldnotbedonem

3、ay/mightnotbedonehadbetternotbedonehavenottobedone疑问式：情态动词+主语+be+p.pcan/could+主语+bedonemust+主语+bedoneshould+主语+bedonemay/might+主语+bedonehad+主语+betterbedonehave+主语+tobedone1.Icanfinishthework.Theworkcanbefinishedbyme.Cantheworkbefinishedbyyou?2.Weshouldplantmanymoretrees.Manymoretreesshouldb

4、eplantedbyus.Shouldmanymoretreesbeplantedbyus?Teenagersshouldbeallowedbyparentstodrivethecar.3.Parentsshouldallowteenagerstodrivethecar.Shouldteenagersbeallowedbyparentstodrivethecar?4.Youcanpasstheexamifyoustudyhard.Theexamcanbepassed(byyou)ifyoustudyhard.Cantheexambepassed(byyou)ifyoustud

5、yhard?water(浇水)Treesmustbewateredbythemeveryday.Theymustwatertreeseveryday.Musttreesbewateredbythemeveryday?Peoplemaycatchfishintheriver.Fishmaybecaughtintheriver(bypeople).Practice:1.Mymothercancookdeliciousmeals.Deliciousmealscanbecookedbymymother.2.Studentswillusethesetextbooksnextterm.T

6、hesetextbookswillbeusednexttermbystudents.3.Youshouldwatertreesoften.Treesshouldbewateredbyyouoften.4.Youmustnotplanttreesinverydryearth.Treesmustnotbeplantedbyyouinverydryearth.3.Sixteen-year-oldsshouldbeallowedtodrive.(先改为否定句，再改一般疑问句)Shouldsixteen-year-oldsbeallowedtodrive?Sixteen-year-ol

7、dsshouldn’tbeallowedtodrive.Yestheyshould./No,theyshouldn’t.4.Ithinktheworkshouldbedoneatonce.(改为否定句)Idon’tthinktheworkshouldbedoneatonce.Drills:1.Weshouldlookafterelderpeopleverywell.2.Weshouldanswerthesequestionsassoonaspossible.3.Wemustcleanourclassro