modalverbs.ppt

1、情态动词（一）一般用法,不同的“肯定”程度可按下列层次排列：Heisathome.(事实)Hemustbeathome.（非常肯定的推断）Hecouldbeathome.（很可能）Heoughttobeathome.（很可能）Hemaybeathome.（仅仅可能而已）Hemightbeathome.（或许,非常不确定）Hemightnotbeathome.（也许不在家）Hemaynotbeathome.（比might可能）Hecouldntbeathome.（很可能不在家）Hecantbeathome.（一定不在家）Heisntathome.（事实）,在不表示推测的情态动词中,我们要注意以下

2、考点:,1.表示能力、许可的情态动词的用法。2.表示否定的情态动词的用法。3.shall和will的多种意义的区别。4.情态动词短语的使用。5.虚拟语气中情态动词的使用。,can,could,beableto,1.can表示允许（二，三人称），或者请求允许（第一人称）。youcangonow.hecanusemybike.canIcomein?canIhaveatalkwithyou?2.could表示请求对方做某事（第二人称）。couldyoushowmeout?couldyougivemesomeadvice?couldyougivemeahand?,3.在否定，疑问，惊叹句中，表示“推测

3、，不相信，惊讶，怀疑”。wherecanhebenow?Hecouldntbeoverfifty.no,itcantbetrue.howcanyoubesocareless!4.can,could,beableto区别.can无第三人称变化，时态couldbeableto多种人称，时态变化.表示过去或将来的能力用beabletocan,could表示有这种能力，没有行使beableto表示有这种能力,且行使,may,might,1.表示“允许，请求允许”mayIcomein?mayIuseyourbike?回答：yes,youmay.no,youmustnt.通常回答：yes,ofcourse

4、./certainly/goahead.pleasedont.,2.表示推测。肯定句：might-maymust否定句：maynot(可能不)-cant(不可能)hemustbeill.hemaybeill.hemightbeill.hecantbeilltoday.hemaynotbeilltoday.,must,have(got)to,1.推测，“一定，准是”2.必须,mustnt禁止youmustfinishittoday。mustIfinishittoday?yes,youmust.no,youneednt/donthaveto.3.must,have(got)tomust主观上必须；

5、无人称时态变化have(got)to由于客观原因，不得不；有多种人称时态变化TodayisSunday.wedonthavetogotoschool.Ihaveafevertoday,soIhadtostayinbed.Hesaidhemustworkhardtocatchupwithothers.,shall,should,oughtto,1.shall“命令，警告，威胁，允诺”（二，三人称）youshalldoasIsay.heshallitinEnglish.heshallbehereatfive.2.shall用来征询意见或者请求指示（一，三人称）ShallIcomeatonce?Sh

6、allwebeginthemeetingnow?Whenshallwehandinpaper?,3.should表示劝告，建议，译成“应该”youshouldkeepyourpromise.youshouldbecarefulintheexams.weshouldbestrictinourwork.4.oughtto=should否定oughtnotto疑问oughthetogo?yes,heoughtto.no,heoughtnotto.,will,would,1.表示“意愿，意志”用于各种人称。Iwilldoitforyou.2.用于疑问句，表示询问对方的意愿或者向对方提出请求（第二人称）

7、，would语气更委婉。Willyoulendmeyourdictionary?Wouldyoulikesomecoffee？Wouldyoupleasetellhimthenews?3.习惯性动作，“总是，惯于”，would表示过去Hewilltalkalotwhenheisfree.Shewouldsitthereforhours.,Need,dare,1.实义动词：人称，时态变化，否定needtodo,dontneedtodare(to)do,dontdare(to)doIneedtothinkitover.shedoesntneedtogoatonce.Whodarestodothat

8、?2.情态动词：needdo,needntdodaredo,darentdohowdareyousaythat?shedarenotdoso.,3.Need需要，必需Needyougonow?yes,Imust.no,Ineednt.其它：hadbetterdowouldratherdowouldliketodo,表示能力:can,could,beableto*beableto能用于各种时态。can/could只能表示现在或过去的能力。*was/wereableto:“设法做成某事”相当于managedtodosth.succeededindoingsth.。,1.表示能力、许可的情态动词的用

9、法。,1.Acomputer_thinkforitself;itmustbetoldwhattodo.A.cantB.couldntC.maynotD.mightnot,2.Thefirespreadthroughthehotelveryquicklybuteveryone_getout.A.hadtoB.wouldC.couldD.wasableto,A,D,3.Theywill_runthismachineontheirowninthreemonths.A.canB.couldC.mayD.beableto4.Thatbigcinema_seat2,000people.A.canB.sho

10、uldC.oughttoD.isableto,D,A,表示许可:may/might,can/could*might,could比较委婉,一般多用于疑问句.*can,may表达的语言比较随便.*在以could,might表示征询对方意见或表示请求时，回答应相应使用can,may.,5.CouldIborrowyourdictionary?Yes,ofcourseyou_.A.mightB.willC.canD.should6.MightIwatchTVaftersupper?Yes,you_.A.mayB.mustC.mightD.can,C,A,2.表示否定的情态动词的用法:部分情态动词的否定

11、式是情态动词中的考点之一。,mustnt不准,禁止neednt没必要(=donthaveto)cant不能;不可能maynot不可以;可能不shouldnt不应该(=oughtnotto),7.You_returnthebooknow.Youcankeepittillnextweekifyoulike.A.cantB.mustntC.needntD.maynot8.Johnny,you_playwiththeknife,you_hurtyourself.A.wont;cantB.mustnt;mayC.shouldnt;mustD.cant;shouldnt,C,B,9.-Willyousta

12、yforlunch?-Sorry,_.Mybrotheriscomingtoseeme.A.ImustntB.IcantC.IneedntD.Iwont10.-MayIpickaflowerinthegarden?-_.A.No,youneedntB.Not,please.C.No,youmustntD.No,youwont,B,C,情态动词：shall,will的多种意义:,shall/will+动词原形:,*shall可表示必须、命令、警告或征询意见.,*will可表示意愿、常出现的动作、在疑问句中表示请求和建议.,*均可表示将来。过去时为should,would.,3.,11.He_be

13、punishedifhedisobeys.如果他不服从,就要受到惩罚.12.Wearenotgoingtoquarrelatallifyou_onlyletmespeak.只要你让我说话,我们根本就不会吵架.13.-Sir,_hegoorstay?-Lethimgo.A.willB.shallC.mightD.could,shall,will,B,14.Thedoor_open.这门经常打不开.15.Ronald_stayinhissmallgardenforalongtimeeverydayinthepast.A.couldB.mightC.shouldD.would16.You_havethebookafterIreadit.我看完以后一定把这本书给你.,wont,D,shall,4.情态动词短语的使用:,wouldliketodowouldratherdowouldrather+从句wouldprefertodo.hadbetterdo.,改错:1.Wouldyoulikehavingsometea?2.Idprefergoingtothele