高中英语《情态动词》ppt课件

情态动词,modalverb,Grammar(陶文武),1,情态动词有一定的意义，但没有人称和数的变化，不能独立使用，它和后面的动词构成谓语只作情态动词的can/could,may/might,oughtto，must可情态可实义的need,dare/dared可情态可助动词的shall/should,will/would相当于情态动词的haveto,usedto,2,Must,can/could,may/might的用法,must,1.Must表示推测时，只能用于肯定句。,这个电脑肯定出了问题。,Theremustbesomethingwrongwiththecomputer.,你努力学了一整天，一定累了吧,Youhaveworkedhardallday.Youmustbetired.,3,2.Must+bedoing/do表示对现在的动作进行肯定推测,他现在一定在看小说,Hemustbereadingnovelsnow.,他们买了一辆新车。他们一定很有钱,Theyhaveboughtanewcar.Theymusthavealotofmoney.,4,3.Must+havedone表示对过去发生的事情作出的肯定判断,他们在玩篮球，他们一定完成了作业。,Theyareplayingbasketball,theymusthavefinishedtheirhomework.,路是湿的。昨天晚上一定下雨了。,Theroadiswet.Itmusthaverainedlastnight.,5,can/could,1.can/could表示推测时，只能用在否定句或疑问句中。,Itssolate.CanTombereading?,这么晚了，汤姆还在看书吗？,这个人不可能是玛丽，她生病了。,ItcantbeMary.Shehasfallenill.,她不可能在说谎。,Shecouldntbetellinglies.,6,2.can/couldhavedone对过去发生行为的可能性进行推测:,刚才我还看见他了，所以他不可能出国的。,Isawhimjustnowsohecouldnthavegoneabroad.,门是锁着的，所以她不可能在家。,Thedoorwaslocked.,Shecouldnthavebeenathome.,7,3.can/couldhavedone“本可以，本来可能已经”用于肯定句中，表示对过去发生的事情做出的判断，,你本来可以考的更好。,Youcouldhavehadabettermark.,may/might,1.May/might表示推测时，只能用于陈述句，表示对现在或将来要发生的动作把握不大。,她们明天可能会到这里来。,Theymaycomeheretomorrow.,8,他们可能还在等我们呢。,Theymaybestillwaitingforus.,2.might可用于指过去的行为或者表示可能性更小。,他也许在作功课吧。,Hemightbedoinghishomeworknow.,我问他我是否可以离开。,IaskedhimifImightleave.,Iaskedhim“MayIleavenow?”,9,3.might/mayhavedone,表示对过去发生的动作进行可能性推测，,他可能去医务室了。,Hemayhavegonetotheclinic.,他可能已经从报纸上知道这个消息了。,Hemighthavereadaboutthenewsinthenewspaper.,10,Will/Wouldyoudo?表请求表意志，愿望，决心would表过去反复发生得动作或某种倾向“总是,总要”usedto表过去常常（现在已没有这种习惯）“过去常常”usedto可于状态动词连用would不可以eg.Heusedtobeaquietboy.()Hewouldbeaquietboy.(),will/would,11,1.-Willyougoskatingwithmethiswintervacation?-It_.(2002上海)alldependedB.alldependsC.isalldependedD.isalldepending,解析：答案B。Italldepends是“不确定”、“看情况”的意思。,高考链接,B,12,2.Ifailedinthefinalexaminationlasttermandonlythen_theimportanceofstudies.(2004重庆)A.IrealizedB.IhadrealizedC.hadIrealizedD.didIrealize,解析：答案为D.句首为“only+副词”时，句子要用部分倒装语序；根据语境应为一般过去时态。,D,13,3.-Iwouldnevercometothisrestaurantagain.Thefoodisterrible!-_.(2004全国)A.NoramIB.NeitherwouldIC.SamewithmeD.SodoI,答案B。第一个句子使用了would,用neither表示附和的意义时，助动词应与上文一致。,B,14,Whenyouareverysureofsomething,youusemustinpositivesentencesandcannotorcantinnegativesentences.,e.g.YoumustbeJeanne.ImMathildeLoisel.Weusedtoknoweachotherverywell.,Itcantbetrue!Idontbelieveit.,Whenyouarequitesureaboutsomething,youusecan.,e.g.Attendingaballcanbeexciting.,Practice1,15,Whenyouthinkthatsomethingispossible,butyouarenotverysure,youusecould,mayormight.,e.g.YoucouldborrowsomejewelleryfromyourfriendJeanne,whoismarriedtoarichman.,YoumaynotknowthatthenecklaceIreturnedisnottheonethatIhadborrowed.,Dontyouhaveafriendwhomightlendyousomejewellery?,16,Practice2:表示推测情态动词的重要用法.,1.YoumustbeMrSmith-Iwastoldtoexpectyouhere.2.Hemusthaveknownwhatwewanted.3.Wemayhavereadthesamereport.4.Hecanthavesleptthroughallthatnoise.5.Theressomeoneoutside-whocanitbe?6.Whatcantheybedoing?7.Thesepillsmighthelptocureyourdisease.8.Youcouldberight,Isuppose.,17,表示推测情态动词的重要用法.,肯定的推测可能的推测否定的推测疑问的推测,must,对将来对现在对过去,情态动词,may,might,cant,couldnt,can,could,+V.+V.+havedone常见mustbe+bedoing,+V.+V.+havedone+bedoing可以用not表示“可能不”,+V.+V.+havedone+bedoing,+V.+V.+havedone+bedoing,18,1.Idontknowwheresheis,she_beinWuhan.2.Atthismoment,ourteacher_ourexampapers.这时，我们老师想必在批改试卷。3.Theroadiswet.It_lastnight.(rain)4.Yourmother_foryou.你妈妈一定一直在找你。,may,mustbemarking,musthaverained,musthavebeenlooking,19,5.Philip_seriouslyinthecaraccident.菲利普可能在车祸中受了重伤.6.-Lindahasgon