情态动词用法概要.ppt

She should cover the cut with the clean cloth. She shouldn’t eat candy any more. They should take some medicine. He should often exercise . * Let’s chant 2).门就是打不开 ! The door won’t open. will/would: I will go to the park with you tomorrow if you will offer me lunch. Question: Is this sentence correct? Why? 情态动词 表示 “意愿” 8.Giving advice (提出意见): You should not/ought not to eat so much before running. How delicious!!! should: 1.Should表示劝告、建议、命令，其同义词是ought to；在疑问句中，通常用should代替ought…to。 Should I open the window? 我们应当要相互学习。 We should learn from each other. ought to have done sth.\should have done sth.本应该做某事,而事实上并没有做; 否定句表示“不该做某事而做了”。 You ought to (should) have been more careful in this experiment. He ought not to have thrown the old clothes away.(事实上已扔了。) 注: ought to 在语气上比should 要强。 should: 2.情态动词should用于第一人称时可以表示说话人的一种谦逊、客气、委婉的语气。 Rose—Sure. By the way, who is your idol? Jack—Liu Xiang, I should say. I should advise you not to do that again. 3. should表示意外或惊讶 常译为 “居然，竟然”。 I can’t believe such a gentleman should be so rude to the old. 我不敢相信这样一个绅士居然对老人如此无礼。 should: 4. should 表示猜测时，一般指按经验或逻辑判断，翻译成“照说应该，估计，想必” should: ---When can I come for the photos ? I need them tomorrow afternoon. ---They _____be ready by 12 : 00 . A. can B. should C. might D. need 3. have to和must 1) 两词都是“必须”的意思, have to 表示客观的需要, must 表示说话人主观上的看法, 即主观上的必要。 2)have to有人称、数、时态的变化,而must 只有一种形式。但must 可用于间接引语中表示过去的必要或义务。 3) 在否定结构中：don’t have to 表示“不必”;mustn’t 表示”禁止”。 You don’t have to tell him about it.　 You mustn’t tell him about it.　　 needn’t 没必要 ( = don’t have to ) can’t 不能; 不可能 may not 可能不 shouldn’t 不应该 ( = ought not to ) 8. You ______ return the book now. You can keep it till next week if you like. A. can’t B. mustn’t C. needn’t D. may not 9. Johnny, you _____play with the knife, you _____hurt yourself. A. won’t ; can’t B. mustn’t ; may C. shouldn’t ; must