情態(tài)動(dòng)詞can, may, must的用法

1、情態(tài)動(dòng)詞情態(tài)動(dòng)詞can, may, mustcan, may, must的用法的用法 情態(tài)動(dòng)詞后接動(dòng)詞原形情態(tài)動(dòng)詞后接動(dòng)詞原形; 沒有人稱和數(shù)的變化沒有人稱和數(shù)的變化; 不能單獨(dú)作謂語(yǔ)不能單獨(dú)作謂語(yǔ), 與后面的動(dòng)詞共同作謂語(yǔ)與后面的動(dòng)詞共同作謂語(yǔ); 其否定形式在后面直接加其否定形式在后面直接加not。Modal verbs情態(tài)動(dòng)詞情態(tài)動(dòng)詞 can / can not may / may not must / must notModal verbs情態(tài)動(dòng)詞情態(tài)動(dòng)詞can / can not1. 表示能力表示能力(會(huì)會(huì)) Mary can speak English, but she can no

2、t speak French.2. 表示允許表示允許(可以可以) Can I use your dictionary? I cant find mine.3. 表示推測(cè)表示推測(cè) (可能可能 ) -通常用于否定形式通常用于否定形式 He cant be in the office. I saw him go out just now.1. S1 _ Kitty _? S2 _.2. S1 _ Kitty _? S2 _.Can spellYes, she canCan addNo, she cant3. S1 _ Derek _? S2 _.4. S1 _ Kitty _? S2 _.Can s

3、ubtractYes, he canCan multiplyNo, she cantmay / may not1. 表示允許表示允許(可以可以) May I come in?2. 表示推測(cè)表示推測(cè) (可能可能) -通常用于肯定形式通常用于肯定形式 She may be still waiting for us.3. 表示祝愿表示祝愿 May you have a happy weekend.may的用法的用法:may / may not以以may開頭的疑問句，其否定回開頭的疑問句，其否定回答用答用cant或或 mustnt。-May I go home now?-Yes, you may. N

4、o, you cant.may not的用法的用法: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 not1. must表示必須表示必須 You must do your homework first.2. must表示表示 一定一定(肯定性推測(cè)肯定性推測(cè) ) He must be at home. must的用法的用法:mu

5、st / must not1. mustnt表示禁止表示禁止(不準(zhǔn)；不允許不準(zhǔn)；不允許) You mustnt smoke here.2. 以以must開頭的疑問句，其否定回答開頭的疑問句，其否定回答要用要用neednt. - Must I clean the classroom now? - Yes, you must. No, you neednt.must not的用法的用法:What do the signs mean? Do you know?You must not cycle.You must be careful.You must turn left.You must not

6、enter.You must pay ten yuan.You must 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_ get up ea

7、rly tomorrow. because I have a meeting.6._you please open the window? CanmaycantmustmustCan9. 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. 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 .1