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Unit 2 Healthy eating,Grammar,Find the sentences containing modal verbs in the reading passage.,Then by lunchtime they would all be sold. What could have happened? Nothing could be better. Something terrible must have happened if ,He could not believe his eyes. Perhaps he should go to the library and find out. He had better do some research! Even though her customers might get thin after eating Yong Huis food, They would become tired very quickly.,a. 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.,Modal verbs,b. 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?,c. should, ought to 都可表示推测。,He ought to / should be home by now. This is where the oil ought to / should be.,注意,should和ought to后面跟动词不定式的完成式, 其肯定句表示“过去应该做而未做”, 其否定句则表示“过去不该做但做了”。,You should / ought to have made the decision a week ago. I shouldnt have made such a foolish mistake. 多数情况下，ought to可与should互换使用。ought to的反意疑问句用shouldnt替代。,You ought to have helped him with his English, _? A. wont you B. ought not you C. shouldnt you D. wouldnt you,2. must和have to must 的用法 1) 表示主观的义务和必要, 主要用于肯定句和疑问句, 意思为“必须，得，要”；由must引起的疑问句，肯定回答要用must或 have to, 否定回答要用neednt 或 dont have to, 意思是“不必” ；,must的否定形式mustnt表示禁止，意思是“不能，不许”。如： Must I finish the task right now? 我现在必须完成这个工作吗？, Yes, you must. / Yes, you have to. 是的。 ( No, you neednt. / No, you dont have to. 不，不必。),You mustnt come here without permission. 未经允许，你不能来这儿。,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 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。,The boss has given everyone a special holiday, so we _ go to work tomorrow. A. cant B. mustnt C. neednt D. shouldnt 【点拨】考查情态动词。根据题意, 可知这里表示“没有必要”, 故只能选C项。, What do you think we can do for our aged parents? You _ do anything except to be with them and be yourself. A. dont have to B. oughtnt to C. mustnt D. cant 【点拨】根据题意“除了和他们呆在一起做你自己外, 没有必要做任何事情。” 可知这里选择dont have to表示“不必”。 故选A项。,3. must和need need作情态动词时, 只能用于疑问句和否定句。构成否定句和疑问句时不借助于助动词do。 Need I finish the work today? Yes, you must. / No, you neednt.,b. 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.,Choose suitable modal verbs below to complete the following dialogues.,ought/oughtnt to should/shouldnt will mustnt neednt (dont) have to can/cant,1. 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.,have to,should,Discovering useful structures,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!,shouldnt,neednt,dont have to/ neednt/ shouldnt,will,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.,have to,mustnt,3. Charles: I wish I could see things clearly in the dark. Tom: Eating carrots _ help you see better. You _ eat some every day.,ought to,should,从A、B、C、D四个选项中，选出可以 填入空白处的最佳选项。 1. I dont really like James. Why did you invite him? Dont worry. He _ come. He said he wasnt certain what his plans were. (北京 2011) A. must not B. need not C. would not D. might not,高考链接,2. I _ worry about my weekend I always have my plans ready before it comes. (上海2011) A. cant B. mustnt C. darent D. neednt 3. Hows your new babysitter? We _ ask for a better one. All our kids love her so much. (浙江2011) A. should B. might C. mustnt D. couldnt,4. You _ buy a gift, but you can if you want to. (湖南2010) A. must B. mustnt C. have to D. dont have to 5. May I take this book out of the reading room? No, you _. You read it in here. (陕西2010) A. mightnt B. wont C. neednt D. mustnt,6. I _ have watched that movie itll give me horrible dreams. (山东2010) A. shouldnt B. neednt C. couldnt D. mustnt 7. Mark _ have hurried. After driving at top speed, he arrived half an hour early. (天津2010) A. neednt B. wouldnt C. mustnt D. couldnt,8. When I was young, I was told that I _ play with matches. (上海2008春) A. wouldnt B. neednt C. mustnt D. darent 9. What sort of house do you want to have? Something big? Well, it _ be big thats not important. (陕西2008) mustnt B. neednt C. cant D. wont,10. What do you think we can do for our aged parents? You _ do anything except to be with them and be yourself. (重庆2007) A. dont have to B. oughtnt to C. mustnt D. cant,11. The boss has given everyone a special holiday, so we _ go to work tomorrow. (上海2007春) A. cant B. mustnt C. neednt D. shouldnt 12. Some aspects of a pilots job _ be boring, and pilots often _ work at inconvenient hours. (湖南2006) A. can; have to B. may; can C. have to; may D. ought to; must,must; oughtnt to; dont have to; couldnt; mustnt; neednt; cant; have to,用所给的情态动词填空。,1. 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.,oughtnt to / dont have to,neednt,练习坊,must; oughtnt to; dont have to; couldnt; mustnt; neednt; cant; have to,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.,have to,mustnt,must / have to,must; oughtnt to; dont have to; couldnt; mustnt; neednt; cant; have to,6. I didnt see her at the meeting this morning; she _ have spoken at the meeting.,couldnt / cant,Homework,Finish Using Structures on Page 50 of Workbook.,
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