1、Modal Verbs()Modal Verbs()must,may,should,will,have tomust,may,should,will,have toStudying the Rule1)A:Its hot,isnt it?B:Yeah,but it may rain tomorrow.2)A:May I sit on this chair?B:No,you mustnt.A:Why not?B:Because it is broken.3)A:The flight to New York shouldbe leaving in a few minutes.B:Are you s
2、ure?4)A:Sally,you should be careful when you go out at night.B:OK,I will.5)A:I have just walked 5 kilometers!B:You must be very tired now.6)A:Will you give this to Elle,please?B:With pleasure.7)A:Its raining cats and dogs outside.B:Really?Then I have to take an umbrella with me.8)A:Must I hand in th
3、e homework now?B:No,you dont have to.You mayhand it in tomorrow morning.9)A:When are we going to leave the hotel?B:We must leave the hotel before 6:00 pm.1.must与have to的区别have to比较强调客观需要,must着重说明主观看法。另外have to能用于更多时态,比较下面的句子：We We had tohad to be there at 10:00.be there at 10:00.有时两者都可以用有时两者都可以用,意思差
4、别不大。意思差别不大。e.g.e.g.We We must/have tomust/have to leave now.leave now.mustmust在表示说话人对事物的推测时在表示说话人对事物的推测时候要注意它比候要注意它比maymay肯定得多肯定得多,相当于相当于汉语的汉语的“一定一定”或或“准是准是”。(只有只有在肯定句中能这样用。在肯定句中能这样用。)This This must bemust be your room your room在回答由在回答由mustmust引起的问题时引起的问题时,如如果是否定的答复，不能用果是否定的答复，不能用mustnt,mustnt,而需要用而
5、需要用needntneednt或或dont have to,dont have to,因为因为mustntmustnt是是“一定不要一定不要”的意思的意思。2.may的用法:a.表示“允许”或“请求”。e.g.May I come in？在使用这一用法时需注意:may表示“允许”的否定形式是must not,意思是“不应该”“不许可”。e.g.May I take this book out of the reading-room？No,you mustntb.表示说话人的猜测，认为某一事情“或许”或“可能”发生。e.g.He may know the answer c.may用在感叹句中可表
6、示祝愿、愿望。e.g.May you succeed(祝你成功。)May you have a pleasant journey(一路平安。)3.should是shall的过去式，它可以用于过去时态中，但更多的是用作情态动词，意思是“应当；应该”，用来表示义务或责任。此时，它不再局限于和第一人称的代词连用，而是三种人称都能使用。例如：You should answer my question in English.你应当用英语回答我的问题。They shouldnt be so careless.他们不该如此粗心。Its raining hard.You should drive slowly
7、.雨下得很大。你开车要慢些。should还可以用在提供帮助、提出建议、要求、给予指示的句子中。例如：Should I help you carry the basket?要不要我帮你提篮子？What should I do for them?我应当为他们做些什么？应当注意的是，当should表示上述两种意思时，要重读。4.will 情态动词 aux.(客气提问)是否愿意；好吗word that you say when you ask a polite question Will you pass the salt?请你把盐递给我，好吗？Will you please give him a m
8、essage when you see him?你见到他时捎个口信给他好吗？Wont you come in and have a little tea?要不要进来喝点茶？Will you please lend me your rubber?请借给我你的橡皮好吗？表推测1.must（一定）只用于肯定句中,He looks so pale.He must be ill.2.can/could用于肯定、否定、疑问句中,It cant be Mr.Wang.He has left here.3.may/might可用于肯定、否定句中There may be some dangerous anima
9、ls on the island.4.should（想必）They should be there by now.5.如果对过去发生的事情的推测要用完成时。Someone must have openedthe cage.The lion couldnt have escaped on its own.准是有人把笼子打开了，狮子不可能自己跑出来。一般疑问句的肯、否定回答1.Can you?2.May you?Yes,I can.Yes,I may.No,I cant.No,I mustnt.3.Must you?4.Need you?Yes,I must.Yes,I must.No,I nee
10、dnt.No,I neednt.No,I dont have to No,I dont have to.could,might,would等过去式用在疑问句表语气委婉时，其回答要用原形。-Could you tell me whats the matter with you?-Yes,I can.Sure./Certainly/Of course.Finding the Rule1)Giving advice2)Saying that something is necessary3)Politely asking someone to do something4)Asking someone
11、for permission to do something5)Saying that perhaps something will happen_476216)Saying that sth.will almost certainly happen,as long as nothing unexpected stops it7)Expressing an opinion about something that the speaker is not sure about.8)Expressing obligation(义务)and duties.9)Expressing need.3589_
12、1)A:Do we have to finish this job today?B:Yes,you_.2)If it is raining,you _ take an umbrella with you.3)Excuse me,but _ I ask you a very personal question?4)I cant be sure,but I _ be late this evening.So dont wait for me.Applying the RuleComplete the following sentences with may,should,must,will or
13、have to.mustshould/mustmaymay5)A:You dont _ return the book now.You can keep it until next Monday if you like.B:Thank you very much.6)The train _ be here any minute now but you never know.7)Excuse me,but _ you please stay off the grass.8)He _ stay at home because his right leg is broken.9)Listen!You
14、 really _ give this to Mary!Its very important.have toshouldwillhas tomust1)Ask your teacher for permission to leave school early tomorrow.Applying the RuleMake sentences by using may,should,must will or have to,based on the following situations.May I leave school early tomorrow?2)Advise your friend
15、 to study harder.You should work harder.3)You are a doctor.Tell a patient that it is really necessary to take all the medicine.4)Someone asks you the time.You havent got a watch but youre sure its ten oclock.You have to take all the medicine.It should be ten oclock.5)Someone ask you if it will rain
16、tomorrow.You dont know.But it is possible.6)You phone is ringing.You are busy.Politely ask a friend to answer it.I have no idea.But it may rain tomorrow.Will you please answer the phone for me?The plane should arrive at 12:00 pm,if nothing goes wrong.7)You are a stewardess.A passenger wants you to t
17、ell him/her the arrival time in Paris.You tell him/her the plane will almost certainly arrive at 12:00 pm,if nothing goes wrong.8)Your son is alone at home.So you tell your friends at the party you need to go home now.Im afraid I have to leave now because my son is alone at home.Self-check1.I am not
18、 sure,but I think Bob _ come to see me today.2.Developed countries think that developing countries _ accept globalization.3.If you need any help,I _ be the first one to give it to you.5.All of us _ learn to be polite and should not smoke or talk loudly in a public place.maymustwillshould6.Lets get e
19、verything ready now.Our guests _ come at any time from now on.7.Look,the light is on.Bob _ be in the room now.8.I hope John _ come tomorrow.I have something important to tell him.9.Adults _ not be rude to children.Otherwise,they _ be rude to adults.10.I saw Mary in the bookstore a few minutes ago.Sh
20、e _ not be in the classroom now.maymustwillshouldwillcant1.In crowded places like airports and railway stations,you _ take care of your luggage.(2007北京卷)A.can B.may C.must D.will2.-How is your tour around the North Lake?Is it beautiful?-It _ be,but it is now heavily polluted.A.will B.would C.should D.must3.She looks very happy.She _ have passed the exam.I guess so.Its not difficult after all.(2007)A.should B.couldC.must D.might
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