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1、八、情态动词和虚拟语气L情态动词基木用法情态动词用法否定式疑问A简答式can能力（体力，智力，技能）尧诈或碎奇（口语中常用）可能性（表猜测，用于否定旬或嶷问句中）cannot/cannot/can5tdoCan...do...?Yes,...can.No,.・・carTt・couldcouldn^tdomay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,…mustrft/cantmightmightnotdoMight...do...?Yes,...mi
2、ghtNo,...mightnot.must必须，应该（表主观要求）肯定，想必〔肯定旬中表推测）mustnot/mustn'tdoMust...do...?Yes,...must.No,...needn,t/don,thavehaveto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,…dontoughtto应当（表示义务责任，口语中多用should）oughtnotto/oughtn^ttodoOught...todo...?Yes,...ough匸N
3、o,...oughtn^t.shall用于一三人称征求对方意见用于二三人称表示许诺、命令、警告、威胁等shallnot/shan^tdoShall...do...?Yes,...shall.No,...shan^t.should应当，应该（表义务责任）本该（含有责备意味）shouldnot/shouldn^doShould...do...?will意愿，决心请求，建议，用袒问句审would比较委婉一willnot/won^doWill/Would...do...?Yes,...will.No—.worTt.wouldwouldnot/w
4、ouldn^dodare敢（常用于否是旬和嶷问句中）darenot/daren^tdoDare...do...?Yes,...dare.No,••.daren^t.need需耍，必须（常用于否定旬和嶷问neednot/needn^tdoNeed…do…？Yes,...must.No,...needn,t.句中）usedto过去常常（现在已木亩）usednot/usedn^/userfttododidn'tusetodoUsed...todo...?Did...usetodo…？Yes,...used.No,…use(d)ntYes,..
5、.did.No,...didn't.II・情态动词的重点知识表示“台匕力、许可”的can和may表示能力的情态动词用can/couldAcomputerthinkforitself:itmustbetoldwhattodo.A・can^tB.mustn^tC.maynotD.mightnot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,以使回筲口气明确（must表示一定，必须，mustn't表示禁止，不许可）。①一CouldIc
6、allyoubyyourfirstname?一Yes,vouA.willBecouldC.mayD.might②Johnny,vouplavwiththeknife,vouhurtyourself.A.won5t/can'tB.mustn^t/mavC.shouldn't/mustD.can^t/shouldn^t在肯定句中could不可以用来表示过去某一特定场合的能力，而要用was/wereableto。ThefirespreadthroughthehotelveryquicklybutEveryonegetout.A.hadtoB.
7、wouldC.couldD.wasableto表示断、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。Petercomewithustonight,butheisrftverysureyet.A.mustBemayC.canD.will而can表示的是逻辑上的可能性：Maryisinpoorhealth.Shecanbeillatanytimes.在否定句中只能用can和mayo所以can't时用以代替mustrft,语气比may更肯定。中文可以翻译为不可能。Mich
8、aelbeapoliceman,forhe'smuchtooshort.A.needn'tB>can%C.shouldD.may在疑问句只能用can,不能用may和must。Hemaybeverybusyn
