6. Using “can” in present and past 2. I couldn’t speak Chinese when I was a kid. 2. I could speak Chinese when I was a kid. 1. I can’t speak Chinese. 1. I can speak Chinese. 否定句 1. 现在时 2. 过去时 肯定句 1. 现在时 2. 过去时
7. Ask and answer Can Kitty spell ? Yes, she can. ____ Derek _______ ? _____________ _____ Kitty ______ ? ______________ ____ Kitty _________ ? _____________ Can multiply Can Can No, he can’t. subtract Yes, she can. Yes, she can. add
8.
9. Using “may” in present, future and past 3. Jack might not be at home. 3. Jack might be at home. 1. Jack may not be angry. Maybe he is tired. 1. Jack may be angry. I can’t tell. Negative forms 1.present 2. past Positive forms 1. present 2. past
10.
11. What do the signs mean? Do you know? You must not cycle. You must be careful. You must turn left. You must not enter.
12. You must pay ten yuan. You must keep silent. You must not turn right. You must not smoke.
13.
14. 3. 表示请求或允许做某事 may 或 can; May I come in ? Can I open the door ? 4. 情态动词的疑问句： 把 can may must 置于句首。 Can you play the guitar? May I come in? Must I finish the work today? Yes ，… .can. No,….can’t Yes ，… .may./Sure No,…may not / can’t . Yes ，… .must. No,…. needn’t .
15. ★★★ Notes : 1 、 can 和 be able to 的区别 : be able to 有 人称数和时态的变化。 I can come tomorrow . He was able to help the old lady. I will be able to come tomorrow. 2 、在回答 must 的疑问句时，否定回答常用 needn’t 或 don’t have to 表示不必，而不用 mustn’t 。 Must we stay here ? No, you needn’t . ( No, you don’t have to .)
16.
17.
18.
19.
20. Ⅰ . 用适当的情态动词填空：。 1.I can play football. __________you swim? 2.Don’t worry. You ________ return me this book tomorrow. 3.My grandma is ill. You _______ talk so loudly here . 4.I can’t play with you. I __________finish my homework first. 5.I__________ get up early tomorrow. because I have a meeting. 6.______________you please open the window? Can may can’t must must Can
21. 9. Nobody ___________live without air. 10._________he speak Chinese ?Yes ,a little. 11. The book _________ be returned before Saturday. 12.__________I come in ?Yes ,please. 13. You ________give up smoking at once. It’s bad for your health. 14. Excuse me ._________I ask you a question? 15. __________you tell me where the station is ? 16. _______ I finish the work now ?No, you _________. You _______ do it this evening. 17. May I use your dictionary ? Sorry , you _________. I am using it now . 18. Look at the ground .It’s very wet .It _______ have rained last night. can Can must May must May Can Must needn’t can can’t must
