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情态动词除情态动词除ought和和have外外,后面只能接不带后面只能接不带to的不定式。的不定式。情态动词没有人称情态动词没有人称,数的变化数的变化,即情态动词第即情态动词第三人称单数不加三人称单数不加-s。情态动词没有非谓语形式情态动词没有非谓语形式,即没有不定式即没有不定式,分分词等形式。词等形式。情态动词的形式情态动词的形式现在时现在时过去时过去时maymightcancouldmust(had to)ought to-willwouldshallshouldneed-daredared-used to Two eyes can see more than one.I am so strong that I can lift this stone.He said that Jack couldnt finish his work in such a short time.Could you follow my step?He is only four,but he is able to read.She was able to do it without my help.Will you be able to come to my party tomorrow?can couldbe able to You can go now.I wont let you down.Could I say it in Chinese?May I know your name?Would you mind closing the door?Shall we dance?Might I have a word with you?语气语气强强 弱弱表许可表许可,征询意见征询意见can,willcould/may/would/shall/might There must be a mistake.You may walk ten miles without seeing a house.He might get there on time.It can be true.In those days few workers could support their families.表可能性表可能性(猜测猜测)must may,might,can,could在肯定句中在肯定句中语气语气强强 弱弱语气语气强强 弱弱 She cant be serious.We couldnt have done better.People may not pick flowers in this garden.She was afraid they might not like the idea.cant,couldntmay not,might not在否定句中在否定句中mustnt,shouldnthad better not We mustnt waste our time.They shouldnt left so soon.Youd better not disturb him.表禁止表禁止 You should do what your parents tell you.If you cant finish the book by then,you must come and renew it.This is a lovely party,but we have to go because of the baby-sister.The bridge was not wide enough so that somebody had to give way.should,musthave to表义务表义务(应应该该)有时态变化有时态变化翻译下列句子翻译下列句子,注意情态动词的不同用法注意情态动词的不同用法:1.Tom,you mustnt leave all your clothes on the floor like this!2.He must have completed his homework;otherwise,he couldnt be enjoying himself by the seaside.(表示禁止表示禁止,意为意为“不许不许”)(must+have+过去分词过去分词,表示对过表示对过去事情肯定的推测去事情肯定的推测)3.Helen may go on the trip with us,but she isnt quite sure yet.4.-Isnt that Anns husband over there?-No,it cant be himIm sure he doesnt wear glasses.(表示可能性表示可能性,意为意为“可能可能”)(对现在的否定性推测对现在的否定性推测,意为意为“不不可能可能”)5.I often see lights in that empty house.Do you think I should report it to the police?6.Children under 12 years old in that country must be under adult supervision when in a public library.(表示应该表示应该)表示义务或必要表示义务或必要,意为意为“必须必须”7.-Who is the girl standing over there?-Well,if you must know,her name is Mabel.8.-Ill tell Mary about her new job tomorrow.-You should have told her last week.表示主张表示主张,意为意为“一定一定要要”表示与过去事实的相反表示与过去事实的相反,意为意为“本应该本应该”9.You cant imagine that a well-behaved gentleman should be so rude to a lady.10.The interest shall be divided into five parts,according to the agreement made by both sides.表示吃惊表示吃惊,意为意为“竟然会竟然会”(表示义务或规定表示义务或规定)11.-Is John coming by train?-He should,but he may not.He likes driving his own car.12.Since it is raining,we have to stay indoors.13.I must go now.There are a lot of things I want to do.(表示对现在或将来的推测表示对现在或将来的推测)(表客观需求表客观需求)(强调主观意图强调主观意图)14.There must be some reason for his absence.15.-Need I do the experiment again after class?-Yes,you must.(No,you neednt/dont have to.)(表示对现在的肯定性推测表示对现在的肯定性推测)need引起的疑问句肯定回答用引起的疑问句肯定回答用must.Practice1.That must be a mistake.No,it _ a mistake.A.must not be B.neednt be C.cannot be D.would not be 2._ I water the trees on Tuesday?No,you neednt.A.Can B.Must C.May D.Shall 3.He _ not pay unless he is punished to pay.A.shallB.will C.can D.would 4.I _ such a mistake again.A.shall never make B.may never make C.can never do D.need never do 5._ I turn on the radio?Youd better not.It is noisy enough in this room.A.Shall B.Must C.Need D.Do 6.Lets go to the library this afternoon,_?A.shall weB.will we C.can we D.should we 7.Where are my keys?I _ lost them.A.ought to B.should have C.will have D.must have 8.Even if he has time,he _ shopping in town on Sunday.A.wont go B.will go C.wont go to D.doesnt go 9.He _ finished earlier.A.shall have B.ought to C.could have D.must have 10.In case I _,I would try again.A.will fail B.would miss C.should fail D.shall miss 11.Since the road is wet this morning,_ last night.A.it must rain B.it must have rained C.it must be rained D.it must have been rained 12.He asked me if he _ open the window.A.shall B.would C.will D.should 13.Everyone _ do his best to make the world safe and clean.A.can B.may C.should D.had to14._ to have lunch with us today?A.Do you like B.Would you like C.Will you like D.Have you like 15.Will you lend me your book?Yes,I _.A.will B.need C.can D.must 16.If I had time,_ see that new movie at the Capital Theater.A.I will B.I may C.I shall D.I would 17.The English of her composition is too good.She cant _ it herself.A.have to write B.have written C.write D.be written 18.You _ the look on his face when he won the lottery.A.would have seen B.can be seeing C.must see D.may see 19.The light is out in her room;she _ to bed.A.must have gone B.had gone C.must be going D.must go 20.They _ that far;but they stopped to have a snack on the way.A.might be gone B.needed go C.could have gone D.ought have gone Correct the mistakes and say why.John shoulds go to school on time.At that time we thought we musted hand in our paper.You must to finish your homework in time.We dont can be there tomorrow.They should may do that.shouldmustcantshould/may从方框中选择合适的情态动词并用其适从方框中选择合适的情态动词并用其适当形式当形式(包括否定式包括否定式)填空。填空。must,can,may,ought to,have to,should1.He _ tell a lie,because he is an honest boy.2.The last bus has gone.We _ take a taxi.3.Harrys been driving all day he _ be tired.musthave tocant4.I knew things are hard with you,but you _ try to get over the difficulties.5.The girl _ know the truth,but I am not sure.maymust/ought to/shouldChoose the correct meaning.1.The captain lets passengers use his cabin.a.Passengers must use the captains cabin.b.Passengers can use the captains cabin.c.Passengers mustnt use the captains cabin.2.There are lectures but you dont have to go to them.a.It is necessary to go to the lectures.b.It isnt necessary to go to the lectures.c.It isnt possible to go to the lectures.3.Swimming from the boat is forbidden.a.You can swim from the boat.b.You must swim from the boat.c.You mustnt swim from the boat.4.Youre not allowed to smoke.a.It is against the rules to smoke.b.You can smoke if you wish.c.You dont have to smoke.5.Passengers are required to take their passports with them.a.They can take their passports with them.b.they cant take their passports with them.c.They must take their passports with them.
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