【优选整合】高中英语人教版必修3 Unit 1 Festivals around the world period 2 课件2 (共25张PPT).ppt

When you are very sure of something, you use must in positive sentences and cannot or can’t in negative sentences. e.g. You must be Jeanne. I’m Mathilde Loisel. We used to know each other very well. It can’t be true! I don’t believe it. When you are quite sure about something, you use can. e.g. Attending a ball can be exciting. Practice 1 When you think that something is possible, but you are not very sure, you use could, may or might. e.g.You could borrow some jewellery from your friend Jeanne, who is married to a rich man. You may not know that the necklace I returned is not the one that I had borrowed. Don’t you have a friend who might lend you some jewellery? Practice 2:表示推测——情态动词的重要用法. 1. You must be Mr SmithI was told to expect you here. 2. He must have known what we wanted. 3. We may have read the same report. 4. He can’t have slept through all that noise. 5. There’s someone outsidewho can it be? 6. What can they be doing? 7. These pills might help to cure your disease. 8. You could be right, I suppose. 表示推测——情态动词的重要用法. 肯定的推测 可能的推测 否定的推测 疑问的推测 must 对将来 对现在 对过去 情态动词 may, might can’t, couldn’t can, could + V. + V. + have done 常见must be + be doing + V. + V. + have done + be doing 可以用not表示“可能不” +V. + V. + have done + be doing + V. + V. + have done + be doing 1. I dont know where she is, she _______ be in Wuhan. 2. At this moment, our teacher ________________ our exam papers. 这时，我们老师想必在批改试卷。 3. The road is wet. It ________________ last night. (rain) 4. Your mother ______________________ for you. 　你妈妈一定一直在找你。 may must be marking must have rained must have been looking 5. Philip _______________