高一英语英语必修3Unit1语法情态动词课件.ppt

1、Modal Verbs,Unit 1,2020年7月28日星期二,2,情态动词表示说话人的某种 感情或语气，对某一动作 或状态的某种态度。 表示“需要、可以、 必须、应当”等。,什么是情态动词？ (Modal Verbs),can/could, may/might, must/ have to, shall/should (ought to), will/would need, dare/dared,2020年7月28日星期二,3,情态动词的特点： 1.情态动词自身都有一定的意义， 但不能表示正在发生或已经发生的 事情，只表示期待或估计某事发生。 2.情态动词除ought和have外，后 面必

2、须接不带to的不定式。 3.情态动词没有人称和数的变化, 也没有非谓语形式。,2020年7月28日星期二,4,1. can的主要用法是： A. 表能力 eg. The girl can dance very well. be able to 通过努力做成某事 He was able to reach Mount Qomolangma in 2000. B. 表示说话者的推测事物的可能性:(否、疑） eg. Can the news be true? C. 在口语中, can可以表示请求或允许： eg. Can I sit here?,1. can和could,2020年7月28日星期二,5,2

3、. could的主要用法是： A. could 是can的过去式, 表示与过去 有关的能力和推测: We all knew that the young man couldnt be a doctor. B. could可以代替can表示请求, 但语气较can客气、委婉: could 提问，答语用can -Could I borrow your pen? -yes, you can.,2020年7月28日星期二,6,may 常用来表示： 1. 在正式文体中表示请求、允许（比can正式）：: eg. May I come in ? You may go now. 2. 表示说话人的猜测: “也许

4、” “可能”: 通常只用于肯定句和否定句中。 The guest may arrive this afternoon. -Can he attend the meeting? -Yes, he_. I am not sure.,2.may和might,may,2020年7月28日星期二,7,3. 表示祝愿,位于句首 eg. May you succeed! May you have a good journey! 4. may as well=had better do (最好做某事） Youd better take notes carefully. You may as well take

5、 notes carefully.,2020年7月28日星期二,8,3.will和would,will是助动词还是情态动词？ will用于构成将来时是助动词。 eg. I will tell you something important. 我要告诉你一件重要的事情。 情态动词：1.表意愿或意志 I will never do it again. If you will marry me, whatever I have is yours, and mines is yours.,2020年7月28日星期二,9,2.提出 请求或建议 ,在疑问句中用于第二人称。 eg: If you want

6、help, let me know, will you? Will you type this, please? 祈使句问句与答语一般用will Open the door, will you? - Please come to my party. - Yes, I will 3. 表习惯或必然结果 Fish will die without water. I will go to see my former classmates on weekends.,2020年7月28日星期二,10,would may D. ought to; must,2020年7月28日星期二,21,3The we

7、ather turned out to be fine yesterday. I _ the trouble to carry my umbrella with me. (2006 江西） A should have taken B could have taken C neednt have taken D mustnt have taken,2020年7月28日星期二,22,4 Hows your tour around the North Lake? Is it beautiful? It _ be, but it is now heavily polluted. （2007 全国I）

8、A. will B. would C. should D. must,2020年7月28日星期二,23,5 I told your friend how to get to the hotel, but perhaps I have driven her there. （2007 陕西） A. could B. must C. might D. should,2020年7月28日星期二,24,7. (10湖南23) You _ buy a gift, but you can if you want to. A. must B. mustnt C. have to D. dont have to

9、 8. (10江西23) I have told you the truth. _ I keep repeating it? A. Must B. Can C. May D. Will,D,A,2020年7月28日星期二,25,9. Its the office! So you _ know eating is not allowed here. Oh, sorry. (2009湖南卷) A. must B. will C. may D. need 10. What do you mean, there are only ten tickets? There _ be twelve. (200

10、9 全国卷I) A. should B. would C. will D. shall,A,A,2020年7月28日星期二,26,11. I cant leave. She told me that I _ stay here until she comes back. (2009 全国卷II) A. can B. must C. will D. may 12. He must be helping the old man to water the flowers, _? (2009 陕西卷) A. is he B. isnt he C. must he D. mustnt he,B,B,2020年7月28日星期二,27,13. - Will you go skating with me this winter vacation