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1、unit2healthyeating-unit2healthyeating-grammargrammar情态动词情态动词情态动词情态动词表示推测表示推测不表示推测不表示推测cancouldmaymightshallshouldmustwillwouldoughttohavetoneed(neednt)dare(darent)usedto*can/could只能表示只能表示现在现在或或过去过去的能力的能力*beableto能用于能用于各种时态各种时态相当于相当于managetodosth./succeedindoingsth.1.表示表示“能力能力”的情态动词的用的情态动词的用法法can,cou
2、ld（beableto）1.He_gotothepartyyesterdayeveninginspiteoftheheavyrain.2.Althoughhe_swim,he_crosstheriver.wasabletocantwasabletomay/might,can/could2.表示表示“许可许可”的情态动词的情态动词 1.-_Igoouttoplay,mum?-No,you_.Youshoulddoyourhomeworkfirst.A.Might;wouldntB.Can;needntC.Can;cantD.Need;mustnt2.-CouldIcallyoubyyourfir
3、stname?-Yes,you_.A.willB.couldC.canD.might3.表示表示“请求请求”的情态动词的用的情态动词的用法法will/would,shall/should*均可表示将来。均可表示将来。过去时为过去时为should,would. * will,would可可表示意愿、常出现的动作表示意愿、常出现的动作。在疑问句中表示请求和建议在疑问句中表示请求和建议.must,could,may,might,cant4.表示表示“推测，可能性推测，可能性”的情态动词的情态动词 can 表示推测时，只能用在表示推测时，只能用在否定句或疑问句中否定句或疑问句中。Its so late
4、. Can Tom be reading?这么晚了，汤姆还在看书吗？这么晚了，汤姆还在看书吗？这个人不可能是玛丽，这个人不可能是玛丽， 她生病了。她生病了。It couldnt be Mary. She had fallen ill.mustntneedntshouldntcant表示否定的情态动词的用法表示否定的情态动词的用法: 不准不准, , 禁止禁止没没必必要要 ( ( = = dont dont have have to to ) )不应该不应该 ( = ought not to )( = ought not to )不能，不可能不能，不可能Couldyouusethemtomakes
5、entences?情态动词能表示时态吗？情态动词能表示时态吗？1. 1. 表示对现在的推测表示对现在的推测2. 2. 表示对过去的推测表示对过去的推测3.3.表示对将来的推测表示对将来的推测表示推测表示推测情态动词的重要用法情态动词的重要用法肯定的推测肯定的推测可能的推测可能的推测否定的推测否定的推测疑问的推测疑问的推测must 对将来对将来对现在对现在对过去对过去情态动词情态动词may,mightcant,couldntcan,could+V.+V.+havedone常见常见mustbe+bedoing+V.+V.+havedone+bedoing可以用可以用not表示表示“可能不可能不”+
6、V.+V.+havedone+bedoing+V.+V.+havedone+bedoinge.g.Youngpeopleshouldlearnhowtousecomputers.Everycitizenoughttoobeylaw.Yououghtnottogo.should常表示劝告、建议、命令，与常表示劝告、建议、命令，与oughtto意义相近，但意义相近，但oughtto多表示责任、义务，语多表示责任、义务，语气强烈。在疑问句中通常用气强烈。在疑问句中通常用should代替代替oughtto。must & have tomusthaveto主观客观主观客观时态现在，将来多种表推测询问意愿
7、否定意禁止，不允许不必must&havetomust用用于于一一般般问问句句中中,肯肯定定回回答答用用must否否定定式式用用neednt或或donthaveto，做做“不不必必”,mustnt表示表示“禁止，不允许禁止，不允许”e.g.MustIfinishallassignmentsatatime?Yes,youmust.No,youneednt.No,youdonthaveto.Youmustntgetoffwhilethecarisstillmoving.1.MayI.?Yes,youmay(can).No,youmustnt/youdbetternot.2.NeedI.?Yes,yo
8、umustNo,youneednt./donthaveto.“情情态动词+havedone”用法用法情态动词情态动词+have +have donedone用法用法例句例句musthavedone1.Shemusthavegonethroughalot.2.HemusthavevisitedtheWhiteHouseduringhisstayintheUnitedStates.may/mighthavedone1.Youmayhavelearntthenews.2.Hemaynothaveheardhisnamecalled.canhavedonecannothavedone1.Whereca
9、nshehavegone?2.Couldhehavedonesuchafoolishthing?3.Theboycanthavefinishedreadingthebooksosoon表示对过去已经发生的行表示对过去已经发生的行为进行为进行肯定肯定推测，意为推测，意为“想必，准是，一定做了某想必，准是，一定做了某事事”只用于只用于肯定句肯定句表示对过去已发生行为的表示对过去已发生行为的可可能能推测，意为推测，意为“也许也许/或许已或许已经（没有）经（没有）“。一般用于。一般用于肯定句或否定句肯定句或否定句中，不用于中，不用于疑问句。用疑问句。用might则表示语气则表示语气更加不肯定。更加不肯
10、定。表示对过去发生的行表示对过去发生的行为的怀疑和不肯定，为的怀疑和不肯定，通常用在通常用在否定句和疑否定句和疑问句问句中。（中。（can换成换成could时语气委婉）时语气委婉）should/oughttohavedone1.Heshouldhaveknownthatthepolicewouldneverallowthissortofthing.2.Yououghtnottohaverefusedhisoffer.neednthavedone1.Youneednthavewateredtheplants,foritisgoingtorain.2.Youneedhavedoneitinstea
11、dofhimyesterday.couldhavedone(不不用用can)1.Hecouldhavekilledhimselfdrivingatadangerousspeed.2.Youcouldhavedonebetter,butyouweretoocareless.mighthavedone(不不用用may)1.Youshouldnotswiminthatsea.Youmighthavebeeneatenbyashark.2.Hemighthavegivenhermorehelp,thoughthewasbusy.用于肯定句时，表示用于肯定句时，表示本该做某事，而实际本该做某事，而实际上
12、未做上未做；用于否定句；用于否定句时，则表示不该做的时，则表示不该做的事反而做了。事反而做了。否定句，表示否定句，表示做了本做了本来不必去做的事，肯来不必去做的事，肯定句，本需做而实际定句，本需做而实际未做未做。表示表示过去能做而没过去能做而没做做的事，有一种对的事，有一种对过去为付诸实施的过去为付诸实施的事情的惋惜。事情的惋惜。表示表示“本来可能本来可能，但实际上没有发生，但实际上没有发生的事情的事情”。另外，还。另外，还可以表示可以表示“本来应该本来应该或可以做某事或可以做某事”之意，之意，含有轻微的责备语气。含有轻微的责备语气。1. -I wonder why they are late
13、? -They _ the train.A.cant have missed B. could missB.C. must have missed D. might missC1.2. Oh, Im not feeling well in the stomach. I _ so much fried chicken just now.2.A. shouldnt eat B. shouldnt have eaten 3.C. mustnt eat D. mustnt have eatenB3. -Has Mike started? He said he would join in the par
14、ty. -He _. He is a man of keeping his word.A. could have left B. must have leftC. cant come D. wont be coming1.4. -There were already five people in the car, but they managed to take me as well.2. -It _ a comfortable journey.3.A.cant be B. mustnt have been 4.C. should be D. couldnt have been 5. BD5.
15、-Why hasnt Jane arrived yet? -She _ again in the morning?A. shouldnt have overslept B. may have turned off the alarm clockC. must have no one t o call herD. should have someone to wake her up6.-Did you go to the movie the day before yesterday? -No. We _, but we decided not to.A.should have gone B. c
16、ould go C. should go D. could have goneBA情态动词考题情态动词考题:1.-Didthetrainarriveintime?-No.It_twohoursago.A.musthavearrivedB.oughttohavearrivedC.mustarriveD.oughttoarrive2.MustIdrivetohishouseandpickupthechildren?No,. A.youshouldntB.youmightnot C.youneednt D.youmustntBC3.WedidntseeTomatthemeetingyesterday
17、.Heit. A.mustnthaveattended B.cannothaveattended C.neednthaveattended D.wouldhavenotattendedB4.You_suchalongcomposition.Theteacheronlyaskedfor300words.Youhavewritten600.A.mustnthavewrittenB.couldnthavewrittenC.neednthavewrittenD.donothavetowriteC5.Thereissomeoneknockingatthedoor.itbeTom? A.canB.mustC.shouldD.oughtto6.Twoyearsago,myhusbandboughtmeabicycle.Ifyouliveintown,itisoftenfasterthanacarandyouworryaboutparking.A.mustnotB.maynotC.shouldnotD.donthavetoAD结束结束
