必修三英语unit1情态动词的用法.ppt

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1、情态动词,Modal Verb,情态动词,情态动词表示说话人的语气和情态的动词。 语气：能力、义务、建议、允诺、许可、推测。 情态：情感和态度。,观察下列各句，注意谓语动词形式。,1.He can finish the paper in an hour. 2.Would you please pass me the dictionary? 3.She may be very busy now. 4.I will never forget the days we spent together. 5.We should help each other.,情态动词的语法特征,1.不能单独做谓语，即是

2、情态动词+动词原形。 例如：I can swim.（谓语） (除ought to “应该”和have to“不得不”外) 2.情态动词没有人称，数的变化。 3.有些情态动词有一般式和过去式，过去式比一般式更委婉。 如can-could , will-would, may-might, shall-should,建议, 请求, 允许, 能力,Jim isnt good at maths, but he can speak English well. May I have a look at your Iphone? Would you like to join my family for din

3、ner? When going by plane, you should arrive on time. When you eat fish, you must be very careful with the bones.,能力,请求/允许,请求,建议,建议,情态动词语法目录,一、can / could 二、may /might 三、will /would 四、shall / should 五、must,I can/ am able to swim. I could/ was able to climb a tree when I was a child. I will be able to

4、 swim next week. The fire spread through the hotel very quickly but everyone was able to get out,1. can 表示现在的能力,2. could表示过去的能力,3. be able to 表能力，可用于多种时态,4. be able to 强调某人通过努力克服困难成功地做了某事,一、情态动词表能力,2. 表“许可”，译为“可以”，could比can语气较委婉。用can 或cannot / cant 回答 -Can /Could I borrow your bike for a moment?-Yes

5、, you can. / No, you cant.,3. 表“可能性”，译为“可能”； Can this news be true? Where can they be? 否定句中，翻译为“不可能” She cant have left school, for her bike is still here.,1表示某人通过努力克服困难做成某事,要用was / were able to. 2 could, might, would 表委婉语气用于疑问句, 答语仍须用 can, may, will. 3 can 用于肯定句中, 可表示”有时可能”,补充：金版12页右边第4点,May I eat

6、KFC if I finish my homework?,may/might:,1. 表示许可。表示请求、允许时，might比may的语气更委婉一些。, Might/May I use your computer? Yes, you can. /No, you cant/you may not / you mustnt.,may/might:,2.用于祈使句中表示祝愿。,3.表示推测、可能（只用于肯定句，疑问句则要用can或could）。,祝你成功！,May you succeed.,He may be very busy now.,May you be happy all your life

7、.,will 和 would Will you give him a message when you see him. 用于第二人称，表“询问意愿，提出请求”would you(用于现在时)语气更为婉转 2. We will help him if he asks us to. 表“意志，意愿”，译为“会”过去时：would I promised that I would do my best.,3. He will always take a walk after supper. 习惯上会发生的事情 During the vacation he would often visit me.(

8、过去式) 4. 某种特定情况下真实或可能的事情 At that time, people would starve if food was difficult to find.,shall:,1.Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见、向对方请示或提供帮助 。,1.Shall we begin our lesson? 2.When shall he be allowed to leave hospital? 3.Shall I carry this bag for you?,shall:,2.Shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。,You

9、 shall fail if you dont work harder. He shall be punished according to the rule. He shall have the book when I finish it.,警告,威胁,允诺,should 1. Young people should respect old people. should 表“义务，建议”。 2. Its five oclock. John should be at home now. 表推测，按道理应当。译为“理应，估计 We have prepared a fridge of good a

10、nd drinks. That should be enough for the party.,3.表示 “竟然” Its a pity that he should be so rude to a lady.,must 表“必须” dont have to dont need to neednt Must we hand in our exercisebooks today? Yes,you must/ No,you dont have to 2.,1. 不必须,mustnt 禁止,表“推测”时： 肯: must be +表语 (一定） 否: cant (不可能) e.g. That can

11、t be Mary. She is in New York. 3. have to “不得不”，表客观需要,You _ buy a gift, but you can if you want to. must B. mustnt C. have to D. dont have to 2. When I was young, I was told that I _ play with fire. A. wouldnt B. neednt C. mustnt D. darent 3. - May I smoke here ? - If you _, choose a seat in the smo

12、king area. A. should B. could C. may D. must,情态动词表推测,可能性的强弱层次 must should/ought to can/could may/might,1. That _ be Anns husband, for I am sure that he doesnt wear glasses. A. cant B. may not C. mustnt D. neednt 2. - Good morning. I got an appointment with Miss Smith yesterday. - Ah, you _ be Mr. Pe

13、ter. A. might B. must C. would D. can,3. What do you mean, there are only ten tickets? There _ be twelve. A. should B. would C. will D. shall 4. It is usually warm in my hometown in March, but it _ be rather cold sometimes. A. must B. can C. should D. would,5. Although this _ sound like a simple tas

14、k, great care is needed. A. must B. may C. shall D. should,32,阅读下列学生书面表达常见错误句子并改正： 1.Thanks to your help,I can back to school again. 2.You will happy when you get a gift. 3.You can be taken Bus No.3 to the theatre. 4.We should to help each other. 5.You can coming a little earlier. 6.You must be retu

15、rn the book before the Summer vacation. 7.I will waiting for you at the entrance . 8.You should bought a small gift when you visit a friend of yours.,go back,be,take,come,wait,buy,33,假如你是李华，你的美国朋友Jack四月份即将来中国旅游，写信向你了解你所在城市的天气、食及交通等方面的情况。请你根据提示用用英文给Jack 写一封回信。 1.四月天气暖和，四月底有点热，建议他带薄外套、T恤和短裤。 2.饮食：有很多中

16、国传统小吃（介绍一两样），如果不习惯中餐，可以去KFC。 3.交通：从机场到你所在城市开车大概2个小时。建议他做大巴比较便宜，打出租车很贵。 4.希望Jack 能多呆几天，以便你可以带他游览风景名胜。 注意：1.可根据情况增加细节以使行文流畅 2.字数100左右。 3.参考词汇： T恤和短裤T-shirt and pants 风景名胜places of interest Dear Jack, I am very excited to know that you will come to China for sight-seeing in April.You want to know somet

17、hing about my city,now I am wtiting to tell you in detail. _,学以致用：根据提示写一篇小短文，注意谓语动词形式。,34,参考范文： Dear Jack, I am very excited to know that you will come to China for sight-seeing in April.You want to know something about my city,now I am wtiting to tell you in detail. It is warm in my city in April,b

18、ut it can be a little bit hot at the end of this month.Thus you dont have to bring thick clothes,just some thin coats ,T-shirts and pants.In your letter,you were worried about the traffic.It is very convenient for you to reach my city.There are buses which will take you here in two hours from the ai

19、rport every thirty minutes.Besides,the price of ticket is reasonanble.You had better not take taxi ,it is too expensive. I hope you can stay here for several days so that I can show you the places of interest in my city.You may experience a very pleasant trip of good view and delicious food.There are many kinds of Chinese traditional food including Jiaozi and Zongzi.If you are not used to these,we can go to the KFC where you can have food you like. I am looking forward to seeing you soon. Yours, Li Hua,35,Thank you.,