英语情态动词课件.ppt

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1、语法专题,情态动词的用法,情态动词的基本用法特点1）情态动词 除 ought 和 have 外，后面只能接动词 原型。2）情态动词没有人称，数的变化，即情态动词第 三人称单数不加-s。3）情态动词没有非谓语形式，即没有不定式，分 词，等形式。,高中阶段都学过哪些情态动词呢,1 can/could/be able to,2 may/might,3 must/have to,4 shall/should,5 will/would,6 need/dare,7 ought to,1 can/could/be able to,1 Some of us can use computers now,but

2、we couldnt last year.（能力）2 It will be sunny in the day time,but it can rain later on this evening（客观可能性）3-Can I go now?yes,you can（请求和允许）4 Could you wait a few days for the memory?（请求）5 1 Can this news be true?2 It cant be our headmaster.he has gone to Beijing.（表推测，主要用于否定和疑问）,*be able to 能用于各种时态。can

3、/could 只能表示现在或过去的能力。*was/were able to:“设法做成某事”相当于 managed to do sth.succeeded in doing sth.。,1.can 与be able to 有何区别？,1.A computer _ think for itself;it must be told what to do.A.cant B.couldnt C.may not D.might not,2.The fire spread through the hotel very quickly but everyone _ get out.A.had to B.wo

4、uld C.could D.was able to,A,D,3.They will _ run this machine on their own in three months.A.can B.could C.may D.be able to,D,2 may/might,1 May I watch Tv after supper?Yes you may/No,you mustnt.（请求许可)2 It may be true./she may come tomorrow/He might have some fever（推测）3 May you succeed!May you have ma

5、ny more days as happy as this one（祝愿）,may/might as well 还是-好we may as well stay where we are,5.Could I borrow your dictionary?Yes,of course you _.A.might B.will C.can D.should6.Might I watch TV after supper?Yes,you _.A.may B.must C.might D.can,C,A,3 must 语 have to 的 用法,1 You must come to school on t

6、ime.You mustnt waste any more time（必须,禁止）,2 Must I come back before ten?Yes,you must.No,you neednt./dont have to,3 It must be our headteacher.You must be hungry after a long walk.（推测),4 I really must go now.I have to go now,because my mother is in hospital.(不得不）,He must be reading,_ he?You must do i

7、t yourself,_ you?He must have gone over the article,_he?It must have rained last night,_ it?,3、表推测语气的反意疑问句的构成,isnt,dont,hasnt,didnt,另外must 还有偏偏一定要的意思why must you play the piano while othersare sleeping.,7.You _ return the book now.You can keep it till next week if you like.A.cant B.mustnt C.neednt D

8、.may not8.Johnny,you _ play with the knife,you _ hurt yourself.A.wont;cant B.mustnt;may C.shouldnt;must D.cant;shouldnt,C,B,9.-Will you stay for lunch?-Sorry,_.My brother is coming to see me.A.I mustnt B.I cant C.I neednt D.I wont10.-May I pick a flower in the garden?-_.A.No,you neednt B.Not,please.

9、C.No,you mustnt D.No,you wont,B,C,4 shall 与 should,1用于一，三人称疑问句表示征求对方的意见和 向对方请示 Shall the driver wait?What shall we do next?,2 用于 二 三人称陈述句表示命令警告，允诺，威胁以及法律条文规定You shall go with me/He shall be punished You shall have the book when I finish itAll the children shall go to school at the age of seven.,3表示劝

10、告和建议You should study hard.,4 表推测They should have arrived by two oclock,5用于if 条件句表示万一Ask Tom to ring me up if you should see him.Shoud I be free tomorrow,I will come.,6 表竟然I dont know why you should be so rude to your mother,Toms father promised,“You _have a new computer if you pass the coming examin

11、ation,”A.can B.should C.shall D.may,C,-When can I come for the photos?I need them tomorrow afternoon.-They _be ready by 12:00.(A.can B.shouldC.might D.need,B,You ought to have helped him with his English,_you?A.wont you B.ought not youC.shouldnt youD.wouldnt you,C,5 will 与 would 的用法,1 表示意志和意愿I will

12、never do it again.They said that they would help us.,2 表请求，建议Will you please take a message for me?Would you please pass him the book?,3 表功能This machine wont work.,4 表示习惯性动作与used to有何区别Fish will die without water.Every evening,he would sit by the window.,6 need 语 dare的用法,既可做实意动词又可做情态动词。做情态动词用于否定和疑问句

13、而做实意动词可用于肯定，否定疑问,How dare you say such a thing?How dare you to say such a thing?,He darent to speak English before such a crowd,did he?He darent speak English before such a crowd,dare he?,She _out alone at night.()A.dare not to go B.dares not go C.doesnt dare to go D.doesnt dares go,C,7 ought to 的 用

14、法,1 表应该与 should 的 区别You ought to take care of him.You are his father.You ought to get him to receive good education,2 表推测He ought to be home by now.He must be home by now.,一 情态动词+完成时表对过去的推测1 must have done（仅用于肯定句)2 cant/couldnt have done(用于否定疑问句）3 may have done（肯定，否定均可)4 might have done（肯定，否定均可),二 表

15、虚拟1 should/could/would/might have done,三 neednt have done would rather have done had better have done,Jenny _with him at that time,for I was having dinner with her in my home.()A.cant have been B.mustnt have been C.must be D.may be,A,They are disappointed at the English party.They say that it _bette

16、r organized.()A.had been B.had to beC.must have been D.could have been,D,-Did you walked home by yourself last night?-Yes,I did.But I think I _.()A.neednt B.shouldntC.may not have D.neednt have,D,8.We_last night,but we went to the concert instead.A.must have studied B.might studyC.should have studie

17、d D.would study9.There was plenty of time.She_.A.mustnt have hurried B.couldnt have hurriedC.mustnt hurry D.neednt have hurried10.Yesterday,Jane walked away from the discussion.Otherwise.She_something she would regret later.A.had said B.saidC.might say D.might have said.,C,D,D,11.-Did you scold him for his mistake?-Yes,but_it.A.Id rather not doB.Id better not doC.Id better not have doneD.Id rather have not done,D,