2017年中考英语专题复习课件 情态动词

课件43张PPT。情态动词的用法初三英语专项复习【热身练习】(1 ) John___ come to see us tonight, but he isn't very sure yet.A. may B. can C. has to D. must ( 2) --May I take this book out?--No, you___. A. can't B. may not C. needn't D. aren't ( 3) You'd better___late next time. A. not to be B. not be C. won't be D. don't be( 4) --He___ be in the classroom, I think.--No, he ___ be in the classroom. I saw him go home a minute ago. can; may not B. must; may not C. may; can't D. may; mustn't (5 ) He had to give up the plan, ___ he? A. did B. didn't C. does D. doesn't【考点直击】１、正确使用can, could , may, might, must ,need，have to, shall ,should ,will, would, ought to ，等。４、had better 的用法２、Must I 和May I 的否定回答。３、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 can’t 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、不确定或猜想的情况,多用于疑问或否定句中。 例如： Can it be true? He can’t be at school, because I met him just now. He couldn't 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 on?　　 -- Yes, you can. / No, you can't. 2）在否定，疑问句中表示推测或怀疑。　　　　 He couldn't 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can’t或 mustn’t。 例如： May I go home now? Yes, you may. No, you can’t. 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 homework right now. You mustn’t smoke here.must 的用法。2、以must开头的疑问句，其否定回答要用needn’t. 例如： Must I clean the classroom now? Yes, you must. No, you needn’t.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 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： don‘t have to　 表示“不必”mustn’t　　　表示“禁止”，You don‘t have to tell him about it.　 你不一定要把此事告诉他。You mustn't tell him about 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）　　　　　　 ... ...