M12 Unit 1 一课时 Microsoft PowerPoint.pptVIP

* The first class Module 12 Traditional life Unit 1 You must wait and open it later. 情态动词must的用法 ⑴must表示主观义务，意思是“必须” 由must引起的疑问句，肯定回答要用must, 否定回答要用needn’t “不必”。 I must finish the work before nine. Must I finish the work before nine ? Yes, you must. No, you needn’t. 情态动词must的用法 ⑵mustn’t表示禁止，意思是“不可以，不要” 由may引起的疑问句，肯定回答要用may, 否定回答要用mustn’t 。 You mustn’t come late tomorrow. May I hand in the paper next time ? Yes, you may. No, you mustn’t. 情态动词must的用法 ⑶must表示肯定的猜测，意思是“一定” You must be a doctor! He must have read the book several times. 2.情态动词can的用法 ⑴can表示允许，意思是“可以” You can go and see the lion dance. You can’t play football in the street. ⑵can表示能力，意思是“会，能够” He can drive a car. ⑶can表示猜测，意思是“可能” She can be at home at the moment. 注意： ⑴在表示客观需要时一般用have to“不得不”，而不用must。 It’s raining heavily so we have to stay at home and do some reading. ⑵在表示能力时，can可以和be able to互换,后者有人称变化和更多的时态变化。 He was able to mend the machine. Let’s make rules (规则) for a zoo. must / mustn’t / can’t feed the animals take away the litter be quiet clap on their cages 课堂小练习 选择填空： 1. “Must I finish all the work before I leave?” “No, you ___ .” A. don’t B. can’t C. mustnt D. neednt 2. “May I come back after 11 p.m. ?” “No, you ___ .” A. don’t B. won’t C. mustn’t D. may not 3. You ___ be quiet when you are in a library. A. may B. can C. will D. must 4. She ___ go to L. A. for Christmas. She hasn’t decided yet. A. may B. will C. should D. must √ √ √ √ This is a _______________ . We can put money in it. purse This is a _______________ . We can play chess on it. chess set This is a bar of _______________ . We can eat it and it tastes sweet. chocolate This is a piece of ______________ . We can wash our hands with it. soap This is a _______________ . We can watch it. DVD This is a _______________ . We can look up new words in it. dictionary This is a p