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1、八、情态动词和虚拟语气I•情态动词慕本用法悄态动词用法否定式疑问式简答式can能力（体力，智力，技能）允许或许可（口语中常用）可能性（表猜测，用于否定句或疑问句中）cannot/cannot/canldoCan...do...?Yes,...can.No,…cantcouldcouldrTtdomay可以（问句中表示请求）可能,或许（表推测）祝愿（用于倒装句中）maynotdoMay...do...?Yes,...may.No,…mustn't/cantmightmightnotdoMight...do...?Yes,...mightNo,...mightnot.mu
2、st必须，应该（表主观要求）肯定，想必（肯定句屮表推测）mustnot/mustn5tdoMust…do…？Yes,...must.No,...needrTt/dorTthavehaveto只好，不得不（客观的必须，有时态和人称的变化）don'thavetodoDo...havetodo...?Yes,…do.No,...don't.oughtto应当（表示义务责任，口语屮多用should）oughtnotto/oughtrfttodoOught...todo...?Yes,...ought.No,...oughtn,t・shall用于一三人称征求对方意见用于二三人称
3、表示许诺、命令、警告、威胁等shallnot/shanldoShall...do...?Yes,...shall.No,…shan't.should应当，应该（表义务责任）木该（含冇责备意味）shouldnot/shouldrTtdoShould...do...?will意愿，决心请求，建议，用在问句中would比较委婉willnot/won,tdoWill/Would…do...?Yes,...will.No,…wontwouldwouldnot/wouldn'tdodare敢（常用于否定句和疑问句屮）darenot/daren5tdoDare...do...?Ye
4、s,...dare・No,...darentneed需耍，必须（常用于否定句和疑问句中）neednot/needn'tdoNeed...do...?Yes,...must.No,…needn't.usedto过去常常（现在已不再）usednot/usedn5t/usen'ttododidn'tusetodoUsed...todo...?Did...usetodo...?Yes,…used.No,...use(d)n,t.Yes,…did.No,…didn't.II•悄态动词的重点知识11表示能力的情态动词用can/couldAcomputerthinkforitsel
5、f;itmustbetoldwhattodo.A.carftB.mustn,tC.maynotD.mightnot”n可ca许的和m表示许可时用may/might,can/could都可以，但在问句中用could...?或might...?以使口气委婉客气，其回答一定要用can或may,以使回答口气明确（must表不定,必须‘mustn't表示禁止，不许可）。①一Could1callyoubyyourfirstname?—Yes,youA.willB.couldC.mayD.miaht②Johnnv,vouplaywiththeknife,youhurtyoursel
6、f・A.wonl/carftB.mustnVmayC.shouldnVmustD.carft/shouidrTt在肯定句中could不可以用来表示过去某一特定场合的能力，而耍用was/wereableto。ThefirespreadthroughthehotelveryquicklybutEveryoneqetout.A.hadtoB.wouldC.couldD.wasableto表示“推断、判断”的canmay,must在肯定句中都可以用来表示可能。在含义上must语气最肯定,may表示的是事实上的可能性。Petercomewithustoniqht,butheis
7、n'tverysurevet.A.mustB.mayC.canD.will而can表示的是逻辑上的口J能性：Maryisinpoorhealth・Shecanbeillatanytimes・在否定句中只能用can和may。所以can't时用以代替mustn't,语气比may更肯定。屮文可以翻译为不可能。Michaelbeapoliceman,forhetmuchtooshort・A.needn'tB.can'tC・shouldD.may在疑问句只能用can,不能用may和mustoHemaybeverybusynow・Canhebeverybusyn
