高考英语Unit11ConflictandCompromise情态动词（课件）.pptx

高中英语情态动词主讲人：某某某老师某某学校

第一节情态动词的基本用法第二节情态动词+havedone第一节情态动词的基本用法第二节情态动词+havedone

第一节情态动词的基本用法

1.can/could1)能够(过去式:could.否定形式cant/couldnt:不能够)Nobodycanstopthedevelopmentofscience.IcantspeakEnglish,butIcanspeaksomeSpanish.

2)可能(不牵涉是否真的发生，客观存在的可能性)Evenexpertdriverscanmakemistakes.Mr.Reedisinpoorhealth.Hecanbeillatanytime.用can表示“可能”，较多地用于否定句和疑问句，而could则不受此限Ifyoudonthaveaguide,youcouldloseyourway.Themooncannotalwaysbeatthefull.Whatcanhepossiblymean?3)允许(can/could无时间上的差异，只是could较为婉转，更有礼貌)YoucannotleaveheretillIcomeback.Anyonecanenrollforthiscourse.

4)cant…too…/cant…enough再…也不为过Youcantbetoocareful/carefulenoughwhendriving.Wecantputtoomuchemphasisoncooperation.

2.may/might1)或许，可能(指事实上的可能性，且might/may无时间上的差异，只是might在口气上更加不确定，从而比较婉转)Imaybebusyfromtomorrowon.Youmaycatchsightofthesunrisefromherewhenyougetupbefore5inthemorning.Hemightbestillwaitingatyouroffice.在疑问句中表示“可能”，用can/could,而不用may/mightWherecanhebe?

Cantheybeangry?may/mightnot有“不可能”及“不允许”两种意思，故表示“不可能”时，常用“cant/couldnt”Thiscantbemyhandbag.ShecantlovePaul.

2)表示允许，许可(might/may无时间上的差异，只是might较为婉转，更有礼貌)MayIcomein?MayIsmokehere?3)may可以用来表示祝愿Mayyousucceed.Mayyouenjoyyourholiday.4)may/might(just)aswelldo不妨……，最好……Youmayaswellstayathome.Sinceitsafineday,wemightaswellwalk.

3.must1)法律/规定上要求的或道德上是必需的，出于职责、义务该做某事Everyonemustbeloyaltohismotherland.Alldriversmustobeythetrafficrules.2)表示出于主观意识而必须要做某事Wemustkeepstepstothescientificdevelopment.Youmusthurryup,oryoullbelate.3)mustbe表示猜测、推测，常用于肯定句中表示猜测(否定:cantbe)Youmustbetiredafterworkingsolong.Thelightsareon.Theymustbeathome.

4)表示禁止(用于否定句)Youmustnotspeakillofothers.Youmustntdoanythingillegal.注意：mustnt只表示“禁止”;若需表示“不可能”，用cant/couldnt;表示“不需要”，用neednt或dont/doesnt/didnthaveto

4.haveto/hasto/hadto1)不得不Animalskeptinthiswaycaneasilygetsick,soth