高中英语情态动词课件

7 ought to 的 用法
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.
6. — Might I watch TV after supper? — Yes, you ___A_____. A. may B. must C. might D. can
3 must 语 have to 的 用法
1 You must come to school on time . You mustn't waste any more time（必须,禁止）
• You ought to have helped him with his English, ____you ?
C
• A. won’t you • B. ought not you • C. shouldn’t you • D. wouldn’t you
5 will 与 would 的用法
1 表示意志和意愿 I will never do it again. They said that they would help us.
It must have rained last night,d_id__n_’t_ it?
另外must 还有偏偏一定要的意思 why must you play the piano while others are sleeping.
7. You ___C___ return the book now. You can
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
---- Did you walked home by yourself last night ?
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---- Yes, I did. But I think I _____. ( D)
A. needn’t
B. shouldn’t
3表示劝告和建议 You should study hard.
4 表推测 They should have arrived by two o'clock
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.
C. I needn’t
D. I won’t
10. --May I pick a flower in the garden? -- ____C____.
A. No, you needn’t B. Not, please.
C. No, you mustn’t D. No, you won’t
4 shall 与 should
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 daren’t to speak English before such a crowd, did he?
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 it All the children shall go to school at the age of seven.
keep it till next week if you like.
A. can’t B. mustn’t C. needn’t D. may not
8. Johnny, you ___B___ play with the knife, you
______ hurt yourself.
A. won’t ; can’t
D. may be
They are disappointed at the English party. They say that it ___better organized. ( D )
A.had been B. had to be C. must have been D. could have been
三 needn't 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
) A.can’t have been B. mustn’t have been C. must be
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 can't /couldn't 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 表虚拟 1 should / could /would /might have done
1 can / could / be able to
1 Some of us can use computers now, but we couldn't 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?
hospital.( 不得不）
3、表推测语气的反意疑问句的构成
He must be reading,i_s_n_’_t he?
You must do it yourself,d_o_n__’t you?
He must have gone over the article, _h_a_s_n_’t_he?
2 may / might
1 May I watch Tv after supper? Yes you may /No ,you mustn't.（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 many more days as happy as this one（祝愿）
succeeded in doing sth.。
1. A computer ___A___ think for itself; it
must be told what to do.
A. can’t
B. couldn’t
C. may not
D. might not
2. The fire spread through the hotel very
2 It can't be our headmaster.he has gone to Beijing.（表推测，主要用于否定和疑问）
1. can 与be able to 有何区别？
*be able to 能用于各种时态。 can / 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.
He daren’t speak English before such a crowd, dare he?
She _____out alone at night. ( C)
A.dare not to go B. dares not go C. doesn’t dare to go D. doesn’t dares go
quickly but everyone __D____ get out.
A. had to
B. would
C. could
D. was able to
3. They will ___D___ run this machine on
their own in three months.
A. can B. could C. may D. be able to
2 Must I come back before ten ? Yes ,you must. No, you needn't./ don't 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
6 表竟然 I don't know why you should be so rude to your mother
Tom’s father promised, “You _C__have a
new computer if you pass the coming examination,”
A.can B.should
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 won't 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.
C.shall D.may
------When can I come for the photos ? I need them tomorrow afternoon.
-----They __B___be ready by 12 : 00 . (
A. can
B. should
C. might D. need
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 ___C____. A. might B. will C. can D. should
B. mustn’t ; may
C. shouldn’t ; must D. can’t ; shouldn’t
9. --Will you stay for lunch?
--Sorry, __B___. My brother is coming to see me.
A. I mustn’t
B. I can’t