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二.情态动词表推测情态动词可用于对将来、现在和过去的情况进行推测，常用于表示推测的情态动词有must,can/could,may/might...的用法must表示推测时，语气最强，“一定，肯定”只用于肯定句，不用于疑问和否定句l.muste.g.He mustbe American..如果表示“一定不、肯定不”，应用不能用表示“禁止”2cant mustntmustifte.g.He mustknow myaddress.He cantknow myaddress.
3.must表示推测时,可以推测
①现在的情况，mustdo/be”一定・・・“
②正在发生的情况，must一定正在做“
③过去已经发生的情况，“一定做过be doingmust havedone e.g.John mustbe athome.The lightis on.Its twelveoclock.They mustbe havinglunch.It must have rainedlast night,for theground iswet thismorning.【注意】表示推测时很少用于将来的情况,如”他明天一定会来”不能说:*加must come可以说:tomorrow.Its certain/Fmsure thathe willcome tomorrow..当表推测，作”一定，准是讲时，反意疑问句后一部分的动词时态根据后的动4must must作发生的时间而定（即还原到动词真实的时态，然后进行反问）e.g.He mustbe athome nowjsntheYou piusthavgseen thefilm last night,didnt you的用法can/could表示推测时，通常只用于疑问句和否定句用于疑问句时，表示询问某种可能性，意Lean can为“会，可能”；用于否定句时，表示“不可能”cante.g.-Can hebe ourteacher-No,he cantbe ourteacher.Our teacheris travellingabroad..四应羡示推测时不仅可用于疑问句和否定句，还可用于肯定句，表示某事有可能发生或可能2是事实还表示过去式，可能性比小Could cane.g.Dont eatit.lt could be poisonous.The planecouldbedelayed byfog.表示推测时,对现在情况的推测不可能”
②对正在发生
3.cant/coukiiit carft/couldnt do/be的情况的推测”不可能正在做”
③对过去情况的推测carft/couldrft bedoing carft/couldnt have”不可能做了”donee.g.There isno lightin theroom.She cantbe athome now.Its solate.They cantbe readingin thelibrary.He cant have goneto Shanghaifor Isawhim aminute ago..在反意疑问句中，当陈述部分含有表示推测意义的时，后一部分的助动词应与、后4cant can面的动词在非推测情况下的用法保持一致e.g.He cantbe ateacher,is heShegant havefinished herhomework,has she的用法may/might表示把握不大的推测，用于肯定句和否定句，不能用于疑问句不表示过去
1.may/might might时态，只是语气上比更委婉，表示的可能性更小may用于肯定句时意为”也许，可能”;用于否定句时意为“也许不，可能不”
2.may/mighte.g.He may/might beAmerican.He may/might notbe athome.
3.may/miqht表示推测时，
①对现在情况的推测may/might do/be”可能.......”
④对将来情况的推测may/might do/be”可能会......e.g.He may/might besleeping now.These studentsmay/might haveseen thefilm before.Exercise
21.You beCarol.You havenchangeda bitafter allthese years.A.must B.can C.will D.shall
2.Harry isfeeling uncomfortable.He toomuch atthe partylastnight.A.could drinkB.should drinkC.would havedrunkD.must havedrunk-I spent two weeks in London last summer.
3.-1spenttwoweeksinLondonlastsummer.-Then youmust havevisited theBritish Museumduring yourstay,youA.mustn^B.haven^C.didn^D.hadnt
4.George toofar.His coffeeis stillwarm.A.must havegoneB.might havegoneC.canthavegoneD.neednt havegone
1.1can*t findmy purse.I itin thesupermarketyesterday,but Imnot sure.A.should leaveB.must haveleftC.might leaveD.could haveleft
6.-You neednttake anumbrella.lt isntgoing torain.-Well,I dontknow.lt do.
7.-Ileft myhandbag onthe train,but luckilysomeonegave itto arailway official.-How unbelievableto getit back!I mean,someone it.【答案】A.will havestolenB.might havestolenC.should havestolenD.musthavestolen21-5ADC CD6-10AB。
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