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1、- 1 - Unit2 情态动词 2 学习目标：掌握本单元情态动词Should,ought to, have to,mustnt ,needn t的用法；提高阅读理解的能力，学习重点：会正确使用这些情态动词的用法。学习难点：能辨别should与 ought to 的区别； must 与 have to 的区别； mustn t ,needn t的用法。学习过程：Task 1:fill in the blanks. 请同学们用学过的情态动词填空。1.She has been cooking all the morning. She be tired now. 2. Don t tell anyb
2、ody what I said. You _ keep it a secret.3. Perhaps he is in his office. =He _ be in his office. 4._ you like a cup of coffee? 5. In China many children _ wear uniform(校服 ) when they go to school. 6. You _ believe everything you read on the Internet. 情态动词2 1. should, ought to都可表示 “ 应该 ” 。ought to 用于表
3、示按道理应当，常指客观的义务或责任，大多数情况下可用should代替，但比should 语气重。I should help her because she is in trouble. You ought to take care of the baby. 表示劝告、建议或命令时，should和 ought to 可通用，但在疑问句中常用should。ought to的否定式为oughtnt to或 ought not to。You should / ought to go to class right away. Should I open the window? What should w
4、e do next? 2.have to 的用法1) must 表示一种主观的需要，而have to 表示一种客观的需要，意思是“ 不得不 ” 。 如：I have to attend an important meeting this afternoon. 今天下午我不得不参加一个重要的会议。Mother is out, so I have to look after the shop. 妈妈不在家，因此我不得不照看商店。2) have to 的否定形式是don t have to, 相当于 neednt。如：They don t have to buy a computer at pres
5、ent. 他们目前没有必要买电脑。3.must 的肯定形式表示“ 必须 ” ，否定式表示“ 禁止、严禁 ” 。You must come here. You mustn t take the book away from the library. Task2:Choose suitable modal verbs below to complete the following dialogues. ought/oughtn t to ;should/ shouldn t ;mustn t ;needn t ; (don t) have to ; will ;can/ cant1 Sam: Ho
6、w can I grow thinner, Mum? Mum: Well, you _ eat food with plenty of fibre that helps you digest better. And you _ stop drinking cola or eating sweet food. Sam: Does it mean I _ eat my favourite fried chicken any more? Mum: Not exactly, if you love fried chicken, you _ give it up. Just eat it less of
7、ten. You _ worry too much: a little fried chicken _ do you good! - 2 - 2 Doctor: You are sick because you ve eaten poisonous mushrooms. Where did you get them? Lucy: I picked them in the forest. I know we _ eat fresh vegetables. Doctor: Oh, but you _ eat them until you re sure they are not poisonous
8、.Lucy: Thank you, doctor. I ll be more careful next time. 3 Charles: I wish I could see things clearly in the dark. Tom: Eating carrots _ help you see better. You _ eat some every day. Task 3:用所给的情态动词填空。must; oughtn t to; don t have to; couldn t;mustn t; needn t; can t; have to1. You _ _ go on worki
9、ng because you look so tired now. 2. The weather turned out to be fine yesterday. I _ have had the trouble to carry my umbrella with me. 3. If you earn more than 5,000, you _ pay tax. 4. You _ play now!You shall finish your homework first! 5. I know things are hard wit h you, but you _ try to get ov
10、er the difficulties. 6. I didn t see her at the meeting this morning; she _ have spoken at the meeting. Task 4:单选1. I thought you _ like something to read, so I have brought you some books. A. may B. might C. would D. must 2. Where is my pen? I _ it. A. might lose B. would hav e lost C. should have
11、lost D. must have lost 3. I didn t hear the phone. I _ asleep.A. must be B. must have been C. should be D. should have been 4. -Is John coming by train? -He should, but he _ not. He likes driving his car. (2002 高考题）A. must B. can C. need D. may 5. -I heard they went skiing in the mountains last wint
12、er. -It _ true because there was little snow there. (2002 北京高考题 ) A. may not be B. won t be C. couldn t be D. mus tn t be6. -There were alrea dy five people in the car, but they managed to take me as well. -It _ a comfortable journey. A. can t be B. shouldn t be C. mustn t have been D. could n t have been
