情态动词表推测 (2).ppt

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1、上一页首 页下一页关于情态动词表推关于情态动词表推测测 (2)(2)现在学习的是第1页,共26页上一页首 页下一页情情态动词表推表推测 肯定推测:肯定推测:must,may,might,could,would,should,ought to否定推测:否定推测:can not,could not,may not,might not.疑问推测:疑问推测:can,could现在学习的是第2页,共26页上一页首 页下一页表示对表示对当前当前行为、状态、情况的推测用:行为、状态、情况的推测用:mustmust,maymay,mightmight,would,should,ought to+would,s

2、hould,ought to+do/bedo/be The light is on,so he must be at home now.灯亮着,他现在肯定在家。She may be at home.她可能在家呢.对现在或未来的推测现在学习的是第3页,共26页上一页首 页下一页must/may/might/could+must/may/might/could+be doingbe doingThe light is on.The light is on.He must/may/might/could be studying.He must/may/might/could be studying.

3、The light isnt on.The light isnt on.He can not/may not/might not/could not be studying.He can not/may not/might not/could not be studying.Can he be studying now?Can he be studying now?对此时此刻正在进行的动作的推测现在学习的是第4页,共26页上一页首 页下一页情态动词情态动词 can,could,may,might,must表表推测的用法:推测的用法:1.must的用法的用法(1)表示推测)表示推测“可能性可能性

4、”时,意思是时,意思是“一定、准一定、准是是”,语气较肯定,较有把握。,语气较肯定,较有把握。He must be American.=It is certain that he is American.他准是个美国人。他准是个美国人。现在学习的是第5页,共26页上一页首 页下一页(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。他肯定知道我的地址。(一定)(一定)He cant kno

5、w my address.他肯定不知道我的地他肯定不知道我的地址。址。(一定不)(一定不)Can he know my address?他知道我的地址吗?他知道我的地址吗?(询问可能性)(询问可能性)现在学习的是第6页,共26页上一页首 页下一页(3)must表示推测时,可以推测现在表示推测时,可以推测现在/正在发生的动作正在发生的动作/过过去发生的动作。去发生的动作。He must have a car now.(现在)他一定有辆小汽车。(现在)他一定有辆小汽车。He must be doing his exercises in the classroom.(正在进行)他一定在教室里做练习。

6、(正在进行)他一定在教室里做练习。He must have finished the work.(过去发生)他一定已(过去发生)他一定已完成了工作。完成了工作。注:注:must表示推测时表示推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 tomorrow.现在学习的是第7页,共26页上一页首 页下一页2.can/could的用法的用法(1)can表示推测表示推测“可能性可能性”时,往往用于否定句或疑问句。时,往往用于否定句或疑问句。Cant“一定不一定不

7、”,can在疑问句中意思是在疑问句中意思是“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。(2)can/cant+have done,表示对过去发生的动作进行推,表示对过去发生的动作进行推测。测。He cant have gone to Shanghai for I saw him a minute ago.他不可能去了上海,我刚才还看见他。他不可能去了上海,我刚才还看见他。Its so late.Where can she have gone?天晚了,她可能去天晚了,她可能去哪儿

8、了呢?哪儿了呢?现在学习的是第8页,共26页上一页首 页下一页3.may和和might的用法的用法(1)may,might表示推测表示推测“可能性可能性”时,意思是时,意思是“可能可能”、“也许也许”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:注:might不表示过去时态,只是语气上比不表示过去时态,只是语气上比may更委婉,更委婉,表示的可能性更小。表示的可能性更小。(2)may,might表推测时,可以用于否定句,意思表推测时,可以用于否定句,意思是是“可能不、也许不可能不

9、、也许不”,但,但不用于疑问句不用于疑问句。He may/might not be at home.他也许不在家。他也许不在家。现在学习的是第9页,共26页上一页首 页下一页情态动词情态动词 will,would表推测的用法:表推测的用法:1.willwould的用法的用法(1)表示推测)表示推测“可能性可能性”时,意思是时,意思是“很有可能,很有可能,大概大概”,表示估计和猜想表示估计和猜想.These things will happen.It would be about ten oclock when she left home.现在学习的是第10页,共26页上一页首 页下一页情态动词

10、情态动词+have+done”表表“本来应该本来应该”使用情况分析使用情况分析一、一、should have done过去本来应该过去本来应该 (而实际上并没有(而实际上并没有)should not have done 本不应该本不应该 而实际上却已经而实际上却已经”含有指责对方或自责的含意。含有指责对方或自责的含意。如如:1、We should have studied last night,but we went to the concert instead.我我们们昨昨晚晚本本应应学学习习的的,但但我我们们却去看音乐会了。(实际上没有学习)却去看音乐会了。(实际上没有学习)现在学习的是第

11、11页,共26页上一页首 页下一页表示过去应该做而实际并没有做,译成表示过去应该做而实际并没有做,译成“理应做理应做”,往往表示遗憾。与,往往表示遗憾。与“should+have+done”should+have+done”用法基本一样。用法基本一样。I ought to have gone home last Sunday.I ought to have gone home last Sunday.我理应上我理应上星期日回家。星期日回家。You ought not to have given him more help.You ought not to have given him more

12、 help.你不应你不应该帮助他那么多。该帮助他那么多。二、“ought to+have+done”现在学习的是第12页,共26页上一页首 页下一页表示对过去行为的怀疑,用于疑问句,译成表示对过去行为的怀疑,用于疑问句,译成“可能可能做过做过吗?吗?”。1.There is no light in the room.Can they have 1.There is no light in the room.Can they have gone out?gone out?屋里没有灯,他们可能出去了吗?屋里没有灯,他们可能出去了吗?2.There is nowhere to find them.W

13、here can they 2.There is nowhere to find them.Where can they have gone?have gone?到处找不到他们,他们可能到什么地方去到处找不到他们,他们可能到什么地方去呢?呢?三、“can+have+done”现在学习的是第13页,共26页上一页首 页下一页四、四、could have done它表示它表示“过去本来能够过去本来能够”实际上没能做实际上没能做。如如1、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米的米的.(实际上没能)(实际上没能)

14、2、He could have passed the exam,but he was too careless.本来他能够通过考试,但是他太粗心。本来他能够通过考试,但是他太粗心。现在学习的是第14页,共26页上一页首 页下一页五、五、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。如,如,1、I need not have got up so early.我本来不必要那么早起床的(我本来不必要那么早起床的(事实上早已起床事实上早已起床)2、I need not have waited for the train for an hou

15、r.我本来不必要等一个小时的火车。我本来不必要等一个小时的火车。(事实上已经等了一个小时)(事实上已经等了一个小时)现在学习的是第15页,共26页上一页首 页下一页六、六、would have done 用在虚拟语气中用在虚拟语气中 表表示示与与过过去去事事实实相相反反之之假假设设的的结结果果,常常与与if 的的条条件件句句连连用用。1、I would have helped you if I had known of your difficulties.要要是是我我当当时时知知道道你你们们的的窘窘境境,我我就就会会帮帮助助你你了(而实际上没有帮助你)了(而实际上没有帮助你)2、If it h

16、adnt rained yesterday,we would have gone out for a walk.假如昨天没下雨,我们就去散步了。假如昨天没下雨,我们就去散步了。(实际上没有去)。(实际上没有去)。现在学习的是第16页,共26页上一页首 页下一页 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现在学习的是第17页,共26页上一页首 页下一页2.That man must be

17、 Sarahs husband.2.That man must be Sarahs husband.-No,he_ be her husband.She is-No,he_ be her husband.She is still single.still single.A.cant A.cant B.mustnt B.mustnt C.may not C.may not D.ought toD.ought to3.Peter _come with us tonight,but 3.Peter _come with us tonight,but he isnt very sure.he isnt

18、 very sure.A.must A.must B.may B.may C.can C.can D.willD.will现在学习的是第18页,共26页上一页首 页下一页 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;must D.must;mustnt;can5.Look,someone is coming.Guess_.-Jack.Hes always on time.A.who can it be B.who he mayC

19、.who he can be D.who it can be现在学习的是第19页,共26页上一页首 页下一页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 with the valuable bottle,you_ break it.A.wont;cant B.mustnt;mayC.shouldnt;must D.cant;shouldnt现在学习

20、的是第20页,共26页上一页首 页下一页8.Susan refuses to marry Jack now.8.Susan refuses to marry Jack now.She _her mind.She _her mind.A.must change A.must change B.should have changedB.should have changedC.must have changed C.must have changed D.would have changedD.would have changed现在学习的是第21页,共26页上一页首 页下一页9.Sue_ com

21、e together with us tonight,but she isnt very sure yet.A.must B.may C.need D.will现在学习的是第22页,共26页上一页首 页下一页10.Aunt Margaret_ the 10.Aunt Margaret_ the train,otherwise she would have train,otherwise she would have arrived here by now.arrived here by now.A.must have missed A.must have missed B.should hav

22、e missedB.should have missedC.had missed C.had missed D.might missD.might miss现在学习的是第23页,共26页上一页首 页下一页Practice11.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现在学习的是第24页,共26页上一页首 页下一页12.If he had been here yesterday,12.If he had been here yesterday,he _ this pop star.he _ this pop star.A.would meet A.would meet B.would have metB.would have metC.met C.met D.must have metD.must have met现在学习的是第25页,共26页上一页首 页下一页2022/9/262022/9/26感谢大家观看现在学习的是第26页,共26页

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