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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 ,neednt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；mustnt ,neednt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. Dont tell anybody 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21. should, ought to都可表示“应该”。ought to用于表示按道理应当，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 we do next?2.haveto的用法1) must表示一种主观的需要，而haveto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) haveto的否定形式是dont have to, 相当于neednt。如： They dont have to buy a computer at present. 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 mustnt take the book away from the library. Task2:Choose suitable modal verbs below to complete the following dialogues.ought/oughtnt to ;should/ shouldnt ;mustnt ;neednt ; (dont) have to ; will ;can/ cant1 Sam: How 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 often. You _ worry too much: a little fried chicken _ do you good! 2 Doctor: You are sick because youve 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 youre sure they are not poisonous.Lucy: Thank you, doctor. Ill 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; oughtnt to; dont have to; couldnt;mustnt; neednt; cant; have to1. You _ go on working 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 with you, but you _ try to get over the difficulties.6. I didnt 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 have lost C. should have lost D. must have lost3. I didnt hear the phone. I _ asleep. A. must be B. must have been C. should be D. should have been4. -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. may5. -I heard they went skiing in the mountains last winter. -It _ true because there was little snow there. (2002北京高考题) A. may not be B. wont be C. couldnt be D. mustnt be6. -There were already five people in the car, but they managed to take me as well. -It _ a comfortable journey. A. cant be B. shouldnt be C. mustnt have been D. couldnt have been 2
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