情态动词中考ppt课件.ppt
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1、情态动词的用法,初三英语专项复习,(1 ) John_ come to see us tonight, but he isnt very sure yet.A. may B. can C. has to D. must( 2) -May I take this book out?-No, you_. A. cant B. may not C. neednt D. arent( 3) Youd better_late next time. A. not to be B. not be C. wont be D. dont be,( 4) -He_ be in the classroom, I t
2、hink.-No, he _ be in the classroom. I saw him go home a minute ago. can; may not B. must; may not C. may; cant D. may; mustnt(5 ) He had to give up the plan, _ he? A. did B. didnt C. does D. doesnt,、正确使用can, could , may, might, must ,need,have to, shall ,should ,will, would, ought to ,等。,、had better
3、 的用法,、Must I 和May I 的否定回答。,、表示肯定和否定的猜测。,【重点归纳 】,情态动词本身具有一定的词义,表示某种感情和语气。例如:You cant do it like that.(表示责备),情态动词后加行为动词原形构成谓语。要掌握的情态动词有:can (could), may(might), must, should.,can 的用法1、表示“会,能够”。例如: He can speak English.2、表示许可或请求,此时可等于may. 例如: You can use this pen. Can I borrow your book?,3、表示怀疑、不确定或猜想的
4、情况,多用于疑问或否定句中。例如: Can it be true? He cant be at school, because I met him just now.He couldnt be a bad man.他不大可能是坏人。,1、can = be able to 但can只有两种时态,而be able to 可用于多种时态。They will be able to tell you the news soon. 他很快就能告诉你消息了。,注意:,2、could不表示时态1)提出委婉的请求, (注意在回答中不可用could)。 - Could I have the television
5、on? - Yes, you can. / No, you cant.2)在否定,疑问句中表示推测或怀疑。 He couldnt be a bad man. 他不大可能是坏人。,may的用法。 1、表示许可或请求,其否定回答用cant或 mustnt。例如: May I go home now?Yes, you may. No, you cant.,2、表示可能性或猜测。 例如: You may be right.3、当表示请求时, might比may 语气更婉转。当表示猜测 时,might比may 更不确 定。,1、表示必须,一定要或禁止。例如: You must do your homew
6、ork right now. You mustnt smoke here.,must 的用法。,2、以must开头的疑问句,其否定回答要用neednt.例如:Must I clean the classroom now? Yes, you must. No, you neednt.,3、must用于一般现在时和一般将来时,而其它形式用“have to” 来代替。如:She had to do some cooking yesterday because her parents were out.,4、比较have to和must 两词都是必须的意思,have to 表示客观的需要, must
7、表示说话人主观上的看法,既主观上的必要。My brother was very ill, so I had to call the doctor in the middle of the night.我弟弟病得很厉害,我只得半夜里把医生请来。(客观上需要做这件事)He said that they must work hard. 他说他们必须努力工作。(主观上要做这件事),在否定结构中: dont have to 表示“不必”mustnt表示“禁止”,You dont have to tell him about it.你不一定要把此事告诉他。You mustnt tell him about
8、 it.你一定不要把这件事告诉他。,need的用法。,need既可做实义动词用,又可做情态动词用。作为情态动词,只能用于疑问句,否定句和条件句。 need 作实义动词时后面的不定式必须带to,,1) 实义动词: need(需要, 要求) need + n. / to do sth2) 情态动词: need,只用原形need后加do,否定形式为need not。Need you go yet? Yes, I must. / No, I neednt.3) need 的被动含义:need doing = need to be done,表示“应该”,有建议的意味,并不表示过去时态。例如: Ever
9、yone should work hard every day.We should protect our living environment,should 的用法。,推测语气,对现在或将来情况推测:I dont know where she is, she may be in Wuhan.,(2)must表对现在的状态或现在正发生的事情的推测时, must 后面通常接系动词be 的原形或行为动词的进行式。 You have worked hard all day. You must be tired. 你辛苦干一整天,一定累了。(对现在情况的推测判断)He must be working
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