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1、关于情态动词等表推测第1页,此课件共21页哦情态动词情态动词 can,could,may,might,must表推测的用表推测的用法法情情态动词态动词中的中的can,could,may,might,must都表推都表推测测。其中。其中mustcan/couldmay/might.must的用法的用法(1)表示推)表示推测测“可能性可能性”时时,意思是,意思是“一定、准是一定、准是”,语语气气较较肯定,肯定,较较有把握。有把握。He must be American.他准是个美国人。他准是个美国人。第2页,此课件共21页哦(2)must表推测只能用于肯定句表推测只能用于肯定句。如表示如表示“一定
2、不、肯定不一定不、肯定不”的意思时,应用的意思时,应用cant,如询问某种可能时,应用如询问某种可能时,应用can。He must know my address.他肯定知道我的地址。(一他肯定知道我的地址。(一定)定)He cant know my address.他肯定不知道我的地址。(一定不)他肯定不知道我的地址。(一定不)Can he know my address?他知道我的地址吗?(询问可能性)他知道我的地址吗?(询问可能性)第3页,此课件共21页哦(3)must表示推表示推测时测时,可以推,可以推测现测现在在/正在正在发发生生的的动动作作/过过去去发发生的生的动动作作。He mu
3、st have a car now.(现现在)他一定有在)他一定有辆辆小汽小汽车车。He must be doing his exercises in the classroom.(正在(正在进进行)他一定在教室里做行)他一定在教室里做练习练习。He must have finished the work.(过过去去发发生)他一定已完成了工作。生)他一定已完成了工作。注:注:must表示推表示推测时测时很少用于将来的情况很少用于将来的情况。一般不用。一般不用He must come tomorrow.可用可用Its certain/Im sure that he will come tomor
4、row.第4页,此课件共21页哦(4)在反意疑)在反意疑问问句中,当附属部分含有表示推句中,当附属部分含有表示推测测意意义义的的must时时,疑,疑问问部分的助部分的助动词应动词应与与must后面的后面的动词动词在非推在非推测测情况下的用法保持一致。情况下的用法保持一致。He must be a worker,isnt he?(现现在)他准在)他准时时个工人,是个工人,是吗吗?You must have learned English for many years,havent you?(完成(完成时时)你一定学了好多年英)你一定学了好多年英语语,是,是吗吗?比比较较:It must have
5、 rained last night,didnt it?(过过去)昨晚一定下雨了,是不是?去)昨晚一定下雨了,是不是?He must have arrived by yesterday morning,hadnt he?第5页,此课件共21页哦 can/could的用法的用法(1)can表示推表示推测测“可能性可能性”时时,往往用于否定句或,往往用于否定句或疑疑问问句。句。Cant“一定不一定不”,can在疑在疑问问句中意思是句中意思是“会、可能会、可能”。He cant be at home.=It is impossible that he is at home.他一定不在家。他一定不在家
6、。(2)can/cant+have done,表示,表示对过对过去去发发生的生的动动作作进进行推行推测测。He cant have gone to Shanghai for I saw him a minute ago.他不可能去了上海,我他不可能去了上海,我刚刚才才还还看看见见他。他。Its so late.Where can she have gone?天晚了,她天晚了,她可能去哪儿了呢?可能去哪儿了呢?第6页,此课件共21页哦(3)could 还还可以用于表示客气、委婉、礼貌的可以用于表示客气、委婉、礼貌的请请求求语语气。气。Excuse me,could you tell me the
7、 way to the bus station?Could you help me?(4)could have done 本能做但未做,表虚本能做但未做,表虚拟语拟语气气 I could have done it well,but I wasnt so careful then.第7页,此课件共21页哦may和和might的用法的用法(1)may,might表示推表示推测测“可能性可能性”时时,意思是,意思是“可能可能”、“也也许许”He may/might be American.=It is possible that he is American.他可能是个美国人。他可能是个美国人。注:
8、注:might不表示不表示过过去去时态时态,只是,只是语语气上比气上比may更委婉,表示的可能性更小。更委婉,表示的可能性更小。(2)may,might表推表推测时测时,可以用于否定句,意,可以用于否定句,意思是思是“可能不、也可能不、也许许不不”,但,但不用于疑不用于疑问问句句。He may/might not be at home.他也他也许许不在家。不在家。第8页,此课件共21页哦(3)may,might可以推可以推测现测现在正在在正在发发生的生的动动作作或或过过去去发发生的生的动动作。作。He may/might be sleeping now.The boy may/might no
9、t be watching TV at home.这这个男孩可能没在家看个男孩可能没在家看电视电视These students may/might have seen the film before.(过过去)去)这这些学生以前可能看些学生以前可能看过这过这部部电电影。影。第9页,此课件共21页哦u Choose the best answers:1.I thought you_ like something to read.So I have brought you some books.A.ought B.might C.would D.must第10页,此课件共21页哦2.That ma
10、n must be Sarahs husband.-No,he_ be her husband.She is still single.A.cant B.mustnt C.may not D.ought to3.Peter _come with us tonight,but he isnt very sure.A.must B.may C.can D.will第11页,此课件共21页哦 4.What_ it be?-It_ be a mail box,for it is moving.It_ be a car.A.can;cant;must B.can;can;mustC.can;mustnt
11、;must D.must;mustnt;can5.Look,someone is coming.Guess_.-Jack.Hes always on time.A.who can it be B.who he mayC.who he can be D.who it can be第12页,此课件共21页哦6.I saw Mary in the library yesterday.-You_ her.She is still abroad.A.mustnt see B.cant have seen C.mustnt have seen D.couldnt see7.David,you _play
12、with the valuable bottle,you_ break it.A.wont;cant B.mustnt;mayC.shouldnt;must D.cant;shouldnt第13页,此课件共21页哦8.Susan refuses to marry Jack now.She _her mind.A.must change B.should have changedC.must have changed D.would have changed第14页,此课件共21页哦9.Sue_ come together with us tonight,but she isnt very su
13、re yet.A.must B.may C.need D.will第15页,此课件共21页哦10.Aunt Margaret_ the train,otherwise she would have arrived here by now.A.must have missed B.should have missedC.had missed D.might miss第16页,此课件共21页哦could have done过去本来能够过去本来能够”实际上没能做实际上没能做I could have run 100 metres in 12 seconds.我本来能用我本来能用12秒钟完秒钟完100米
14、的米的.(实际上没能)(实际上没能)If you could have finished the task in time,you could have been promoted.如如果果你你当当时时能能如如期期完完成成那那任任务务的的话话,你你可可能能已已提提升升了了(实实际上没有被提升)际上没有被提升)第17页,此课件共21页哦情态动词情态动词+have+done”表表“本来应该本来应该”should have done过去本应该做而没做过去本应该做而没做should not have done本不本不应该应该 而而实际实际上却已上却已经经”We should have studied
15、last night,but we went to the concert instead。You shouldnt have climbed that hill,it is too dangerous.第18页,此课件共21页哦need not have done它表示过去已做的事,事实上没有必要。它表示过去已做的事,事实上没有必要。(不需不需要做而做了)要做而做了)I need not have got up so early.我本来不必要那么早起床的(事实上早已起床)我本来不必要那么早起床的(事实上早已起床)I need not have waited for the train for an hour.我我本本来来不不必必要要等等一一个个小小时时的的火火车车。(事事实实上上已已经经等等了了一一个小时)个小时)第19页,此课件共21页哦Practice1.Mr White _ at 8:30 for the meeting,but he didnt turn up.A.should have arrived B.should arrive C.should have had arrived D.should be arriving第20页,此课件共21页哦感谢大家观看第21页,此课件共21页哦