情態(tài)動(dòng)詞can, may, must的用法.ppt

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1、情態(tài)動(dòng)詞 can, may, must的用法 情態(tài)動(dòng)詞后接動(dòng)詞原形 ; 沒有人稱和數(shù)的變化 ; 不能單獨(dú)作謂語 , 與后面的動(dòng)詞共同作謂語 ; 其否定形式在后面直接加 not。 Modal verbs 情態(tài)動(dòng)詞 can / can not may / may not must / must not Modal verbs 情態(tài)動(dòng)詞 can / can not 1. 表示能力 (會 ) Mary can speak English, but she can not speak French. 2. 表示允許 (可以 ) Can I use your dictionary? I cant find

2、 mine. 3. 表示 推測 (可能 ) -通常用于否定形式 He cant be in the office. I saw him go out just now. 1. S1 ___ Kitty ____? S2 _____________. 2. S1 ____ Kitty ____? S2 _____________. Can spell Yes, she can Can add No, she cant 3. S1 ____ Derek ________? S2 _____________. 4. S1 ____ Kitty _______? S2 _____________. C

3、an subtract Yes, he can Can multiply No, she cant may / may not 1. 表示 允許 (可以 ) May I come in? 2. 表示 推測 (可能 ) -通常用于肯定形式 She may be still waiting for us. 3. 表示祝愿 May you have a happy weekend. may的用法 : may / may not 以 may開頭的疑問句，其否定回 答用 can t或 mustn t。 -May I go home now? -Yes, you may. No, you cant. ma

4、y not的用法 : Answers: 1. May I carry your bag for you? 2. May I open the door? 3. May I get you a chair? 4. May I switch on the TV? 5. May I borrow your new bicycle? must / must not 1. must表示必須 You must do your homework first. 2. must表示 一定 (肯定性推測 ) He must be at home. must的用法 : must / must not 1. must

5、nt表示禁止 (不準(zhǔn)；不允許 ) You mustnt smoke here. 2. 以 must開頭的疑問句，其否定回答 要用 neednt. - Must I clean the classroom now? - Yes, you must. No, you neednt. must not的用法 : What do the signs mean? Do you know? You must not cycle. You must be careful. You must turn left. You must not enter. You must pay ten yuan. You m

6、ust keep silent. You must not turn right. You must not smoke. . 用適當(dāng)?shù)那閼B(tài)動(dòng)詞填空：。 1.I can play football. __________you swim? 2.Dont worry. You ________ return me this book tomorrow. 3.My grandma is ill. You _______ talk so loudly here . 4.I cant play with you. I __________finish my homework first. 5.I___

7、_______ get up early tomorrow. because I have a meeting. 6.______________you please open the window? Can may cant must must Can 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.

8、 13. You ________give up smoking at once. Its 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 .Its very wet .It _______ have rained last night. can Can must May must May Can Must neednt can cant must