情態(tài)動詞及情態(tài)動詞的被動語態(tài)

含情態(tài)動詞的被動語態(tài)

2021/6/271情態(tài)動詞有哪些?can/may/must/will/shall/should/oughttoneed/darehadbetter/wouldrather,usedto/ haveto/beableto2021/6/272情態(tài)動詞的含義序號原形過去式主要含義1cancould2maymight3mustmusthadto4needneeded5daredared6willwould7shallshould1.能力2.請求/準許3.可能性1.請求/準許2.可能性*3.祝愿1.義務(wù)(必須);2.猜測(肯定)需要敢愿意1.征求意見2“應(yīng)該”(should)2021/6/273序號原形過去式主要用法8beabletowas/wereableto9havetohadto10oughttooughtto11usedto12hadbetter13wouldrather“能夠”（能力）“不得不/必須”“應(yīng)該”“過去（常常）”“最好”“寧愿”情態(tài)動詞的含義2021/6/274

can/couldbedone

mustbedone

shouldbedone

may/mightbedonehadbetterbedone

havetobedone含情態(tài)動詞的被動語態(tài)：情態(tài)動詞+be+PP2021/6/275否定式：情態(tài)動詞+not+be+p.p

can/couldnotbedone

mustnotbedone

shouldnotbedone

may/mightnotbedonehadbetternotbedone

havenottobedone2021/6/276疑問式：情態(tài)動詞+主語+be+p.p

can/could+主語+bedone

must

+主語+bedone

should+主語+bedone

may/might

+主語+bedonehad+主語+betterbedone

have+主語+tobedone2021/6/2771.Icanfinishthework.Theworkcanbefinishedbyme.Cantheworkbefinishedbyyou?2.We

shouldplantmanymoretrees.Manymoretreesshouldbeplantedbyus.

Shouldmanymoretreesbeplantedbyus?2021/6/278Teenagers

shouldbe

allowedbyparentstodrivethecar.3.Parentsshouldallowteenagerstodrivethecar.Shouldteenagers

be

allowedbyparentstodrivethecar?4.Youcanpasstheexam

ifyoustudyhard.Theexamcanbepassed(byyou)ifyoustudyhard.Cantheexambepassed(byyou)ifyoustudyhard?2021/6/279water(澆水)Treesmustbewatered

bythemeveryday.Theymustwatertreeseveryday.Musttreesbewatered

bythemeveryday?2021/6/2710Peoplemaycatchfishintheriver.Fishmaybecaughtintheriver(bypeople).Practice:2021/6/27111.Mymother

cancookdeliciousmeals.

Deliciousmealscanbecookedbymymother.2.Students

willuse

thesetextbooksnextterm.Thesetextbooks

willbeusednexttermbystudents.3.Youshouldwatertreesoften.Treesshouldbewateredbyyouoften.4.Youmustnotplanttreesinverydryearth.Treesmustnotbeplantedbyyouinverydryearth.2021/6/27123.Sixteen-year-oldsshouldbeallowedtodrive.(先改為否定句，再改一般疑問句)

Shouldsixteen-year-oldsbeallowedtodrive?Sixteen-year-oldsshouldn’tbeallowedtodrive.Yestheyshould./No,theyshouldn’t.4.Ithinktheworkshouldbedoneatonce.(改為否定句)Idon’tthinktheworkshouldbedoneatonce.2021/6/2713Drills:1.Weshouldlookafterelderpeopleverywell.2.Weshouldanswerthesequestionsassoonaspossible.3.Wemustcleanourclassroomthisafternoon.4.Youmusthandinyourhomeworkbeforenineo’clock.5.Youcanbringyourfriendstomybirthd