高一英语情态动词的用法(新人教版).ppt

Grammar,课标人教实验版 高一 Module 3 Unit 1,情态动词用法,1) can的主要用法是： A. _： eg. The girl can dance very well. B. _： eg. Can the news be true? C. _: eg. Can I sit here?,can 和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）,其他用法：表示请求，命令，惊讶，不相信等。 Can you help me to lift it, please? If you wont keep quiet, you can get out! You cant be serious!,2) could的主要用法是： A. _ _: eg. 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,eg. Could you lend me your bike? Could I use your bike?-Yes， you can,3表示现在的可能与能力，可能性要小。 Whats for dinner? I could eat a horse. My wife is in hospital. Our baby could arrive at any time. 4 表轻微的责备。 You could be more careful.,5) eg. They cant /couldnt have gone out because the light is still on.,cant /couldnt have done 过否猜,must do/be 现肯猜 cant do/be 现否猜 must have done 过肯猜,must表示推测，语气非常肯定，近乎确定的意味，一般用在肯定句。 如：It must be eleven oclock now. He must go crazy. If Mary didnt leave here until five oclock, she cant be home yet. 如果玛丽五点才离开这儿，他此时一定还未到家。,may 和might ： may 常用来表示： A. _ eg. May I come in ? Yes, please. B. _,表示请求、允许;比can正式:,eg. -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. _ eg. 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和would：,1. I will tell you something important. 我将要告诉你一些重要的事,Will you tell her that Im here? 请您告诉她说我在这儿，好吗? I told him not to do it, but he would.,（助动词）,（情态动词）,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/请求”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,3. _ 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和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 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.,2.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。,3. eg: 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”。,must 的主要用法：,1. _ eg: We must all die. 人总要死的。 2. _ eg: You must get up early. 你必须早起来。,表示必然性。,表示强制/义务。,如：We mustnt waste our time. - May I take this magazine out? - No, you mustnt.,注意: must not : “禁止”。,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,表示推测，意为“一定是”。 must+v 对现在的推测 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 表示“偏偏”，表达对某事的不满或责备等情绪。 Why must it rain on Sunday?,-_ 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. There _ be any difficulty about passing the road test since you have practised a lot in the driving school. A. mustnt B. shant C. shouldnt D. neednt,C,6. -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,When can I come for the