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modalverbGrammar(陶文武)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,usedtoMust,can/could,may/might的用法must1.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.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.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.can/could1.can/could表示推测时，只能用在否定句或疑问句中。It’ssolate.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。Itcan’tbeMary.Shehasfallenill.她不可能在说谎。Shecouldn’tbetellinglies.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。Isawhimjustnowsohecouldn’thavegoneabroad.门是锁着的，所以她不可能在家。Thedoorwaslocked.Shecouldn’thavebeenathome.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/might1.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.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?”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.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/would1.----Willyougoskatingwithmethiswintervacation?----It___.(2002上海)A.alldependedB.alldependsC.isalldependedD.isalldepending解析：答案B。Italldepends是“不确定”、“看情况”的意思。高考链接B2.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。D3.----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。BWhenyouareverysureofsomething,youusemustinpositivesentencesandcannotorcan’tinnegativesentences.e.g.YoumustbeJeanne.I’mMathildeLoisel.Weusedtoknoweachotherverywell.Itcan’tbetrue!Idon’tbelieveit.Whenyouarequitesureaboutsomething,youusecan.e.g.Attendingaballcanbeexciting.Practice1Whenyouthinkthatsomethingispossible,butyouarenotverysure,youusecould,mayormight.e.g.YoucouldborrowsomejewelleryfromyourfriendJeanne,whoismarriedtoarichman.YoumaynotknowthatthenecklaceIreturnedisnottheonethatIhadborrowed.Don’tyouhaveafriendwhomightlendyousomejewellery?Practice2:表示推测——情态动词的重要用法.1.YoumustbeMrSmith----Iwastoldtoexpectyouhere.2.Hemusthaveknownwhatwewanted.3.Wemayhavereadthesamereport.4.Hecan’thavesleptthroughallthatnoise.5.There’ssomeoneoutside----whocanitbe?6.Whatcantheybedoing?7.Thesepillsmighthelptocureyourdisease.8.Youcouldberight,Isuppose.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,mightcan’t,couldn’tcan,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+bedoing1.Idon'tknowwheresheis,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。maymustbemarkingmusthaverainedmusthavebeenlooking5.Philip________________________seriouslyinthecaraccident.菲利普可能在车祸中受了重伤.6.---Lindahasgonetowork,butherbicycleisstillhere.---She_____________________(go)bybus.7.Mike________________hiscar,forhecametoworkbybusthismorning.迈克一定还没有找回他的车，因为早上他是坐公共汽车来上班的。may(might)havebeenhurtmay(might)havegonecan’thavefound