英语课件高二英语情态动词的用法.ppt

Grammar,情态动词用法,can & could,must,may & might,will & would,shall & should,1) can的主要用法是： A. _： The girl can dance very well. B. _： Can the news be true? C. _: Can I sit here?,can & could：,表示能力,表示推测可能性,表请求或允许,（多用于疑问否定句中）,2) could的主要用法是： A. _ _: We all knew that the young man couldnt be a doctor. 我三岁就能看书了。 Father said I could go out with my friends.,could 是can的过去式, 表示过去 的能力,许可和推测,B. could可代替can表示请求, 语气委婉 (主要用于疑问句）,Could you lend me your bike? Could I use your bike?-Yes， you can.,3) They cant /couldnt have gone out because the light is still on.,cant /couldnt have done 过去否定猜测,must do/be 现肯猜 cant do/be 现否猜 must have done 过肯猜,must:,1). _ We must all die. 人总要死的。 2). _ You must get up early. 你必须早起来。,表示必然性。,表示强制/义务。,We mustnt waste our time. - May I take this magazine out? - No, you mustnt.,3). must not : “禁止”。,4). must 用于一般疑问句的时候， 肯定回答用yes, please 或者 Im afraid so, 其否定回答用 neednt 或者 dont have to,5).表示推测，意为“一定是”,语气非常肯定，近乎确定的意味，一般用在肯定句。 must+ v 对现在的推测 It must be eleven oclock now. He must go crazy. must+ have+过去分词 对过去的推测 must+ be+ v-ing 对将来或现在进行时的推测 6).表示“偏偏”，表达对某事的不满或责备等情绪。 Why must it rain on Sunday?,may & might ： may 常用来表示： A. _ May I come in ? Yes, please. B. _,表示请求、允许;,-I believe the man is from England. -But I may be wrong. The guest may arrive this afternoon,表示猜测,答语避免使用may，以免显得 太严肃或太不客气,The road may be blocked. 这条路可能不通了。 The road can be blocked. 这条路可能会是不通的。 在疑问句中，表示可能性用can。 如：Where can he be? 他会在哪呢？,可能性从大到小: must. can could may might,C. _ May you succeed! May you have a good journey!,表示祝愿;语气较正式:,多在间接引语中表示过去的可能和允许。,也可以表示现在的可能性，但是比may 表示的可能性更小，且might可以用于虚拟 语气，may不可以。,might 的用法有: She said that he might take her bike. 她说他可以拿她的自行车去用。 You might get some help from her if she were here.,will & would：,1). I will tell you something important. 我将要告诉你一些重要的事。,Nancy will stick to her way of life. I told him not to do it, but he would.,will是助动词或是情态动词 用于构成将来时是助动词。 用于表“意志/决心”是情态动词。 would亦同理，只是表过去。,2). _ If you want help, let me know, will you? 如果你需要帮助, 让我知道, 好吗? Would you type this, please? 请打印这个，好吗？ Wont you sit down? 请坐下，好吗？,疑问句中用于第二人称，提出请求,表委婉不是表过去,This will be the book you want. He will have arrived by now. The guests would have arrived by that time. I thought you would have finished this by now. This will be the building you are looking for .,3).用“will be”和“will (would) + have + 过去分词”的结构表示推测，主要用于第二、三人称。前者表示对目前情况的推测，后者表示对已经完成的动作或事态的推测。,4)._ Would you help us, please? 请您帮助我们，好吗？ Id go there with you. 我要和你一块到那儿去。 Teacher wouldnt allow it. 老师不会允许这件事。,（表请求）,would比will客气委婉。,（表意愿）,（表许可）,shall & should：,1). Perhaps I shall pay a visit to England this winter.可能今年冬天我会去英国观光。 （构成一般将来时, 助动词）,shall用于构成将来时是助动词。,（表 “决心”，情态动词）,Shall we go by train, Mom? 妈妈，我们乘火车去好吗？ Shall he come in?要他进来吗？,2).用于征求意见,是情态动词,一般用于第一 一人称和第三人称,（表 “决心”，情态动词）,Dont worry, you shall get the book. Nothing shall stop us. You shall get what you deserve. He shall be punished if he breaks the rule. No one shall smoke here.,3).用于表允诺，决心，警告，命令,或 颁布法令规定等。用于二三人称。,4). You should keep your promise. 你应该遵守诺言。 You should call the police. *表示“按理说”。 Its 8 oclock now, he should be here at any moment. *表埋怨，用于“Shouldnt ?” Shouldnt you be doing your homework now?,should表示义务/建议/劝告，意为 “应该”。,-_ I go out to play, mum? -No, you_. You should do your homework first. A. Might; wouldnt B. May; had better not C. Must; mustnt D. Need; mustnt,B,2. -Where is Emma? -I cant say for sure where she is, but she_ be out shopping. A. can B. should C. must D. may,D,3. The room is in a terrible mess; it _ cleaned. A. cant have been B. couldnt be C. may have been D. would be,A,4. How_ you say that you really understand the whole story if you have covered only part of the article? A. can B. must C. need D. may,A,5. What does the sign over there read? “No person _ smoke or carry a lighted cigarette, cigar or pipe in this areas.” A. Will B. may C. shall D. must,C,6.Has Mr. Tom White arrived? Yes, already _he wait outside or just come in? Shall B. May C. Could D. Must,A,7. -Jane has just come back from China and she looks happy. - She _ her trip very much. must enjoy B. must have enjoyed C. may enjoy D should have enjoyed,B,8. You cant imagine that a well-behaved gentleman _ be so rude to a lady. might B. need C. should D. would,C,表示惊讶的语气,9. The terrible accident is under investigation. Actually , quicker action _those workers trapped in the mine. A. might have saved B. must have saved C. should have saved D. could have saved,D,10. He chose to teach in a western province, though he _in the city for a better life. could stay B. would stay C. could have stayed D. had stayed,C,11. We _ here at lunch time ; we were delayed at the airport, though. A. could be B. should be C. must have been D. would have been,D,12. How I wish I _ my mouth before I shouted at my um ! A. shut B. have shut C. had shut D. would shut,C,13. We must apply what we have learnt to our daily work because in no case _ from practice. should theory separate B. should theory be separated C. theory should separate D. theory should be separated,B,14. Who has made a mess in my room? Who else _it but your naughty son? A. could do B. could have done C. should do D. Should have done,B,15. Its really a wonder that all the passengers on board _ while the plane itself sank into the freezing Hudson River in New York. must have been saved should have been saved would be saved D. might be saved,B,16. You _ late f