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课件网) Unit 5 The Value of Money Teaching objectives 1.identify and figure out the meanings and functions of some modal verbs modal verbs(情态动词）. 2.better understand and express feelings and attitudes by analyzing the modal verbs. 3.talk about future events in the past using “would do” and “was / were going to do”. Period 3 Discovering Useful Structures Read the sentences below and think about: What are the functions and meanings of these modal verbs a polite request May we ask what you’re doing in this country and what your plans are intention If you’ll excuse me, I ought to be on my way. You can't open it until two o'clock. a permission a polite request Could you offer me work here Lead-in 常见情态动词、其缩略形式 情态动词 否定缩略形式 can could couldn't may mayn’t might mightn’t shall should shouldn’t ought to oughtn’t to 情态动词 否定缩略形式 had better must mustn’t have to will would wouldn’t dare daren’t need needn’t can't shan't had better not won't How many modal verbs do you know don’t/doesn’t have to Lead-in 情态动词的定义 情态动词 (Modal verb) 情感 & 态度 1. You needn’t try it if you don’t want to. 2. The man can speak two foreign languages. 3. The poor boy had to face the problem bravely. 情态动词_____独立作谓语，只能和_____一起构成谓语，没有数的变化，具有助动词功能。 不能 动词原形 Explanation 1.只作情态动词的： 2. 可情态可实义的： 3. 可情态可助动词的: 4. 相当于情态动词的: 情态动词的分类 can/could, may/might, ought to, must need, dare/dared shall/should, will/would have to, used to Explanation 情态动词的用法 can & could (1) 表能力，“能，会” She can speak English. She could play the piano at the age of three. be able to能用于各种时态；can/could只能表示现在或过去的能力。was/were able to“设法做成某事”相当于managed to do sth// succeeded in doing sth All the people trapped in the burning house were able to get out of it. (2) 表请求和许可，“可以”，could比can更加委婉，表示礼貌 Can I smoke here —Could I use your computer —Yes, you can. (3) can表客观可能性，“有时候会”，用于肯定句 A wise man can sometimes make a mistake. (4) can表推测，用于疑问句、否定句。肯定句用must Can the news be true He can’t be at home because I saw him here just now. can/could与be able to的区别 1. The man can/could speak two foreign languages. 2. Yesterday I was able to get home before the heavy rain. can/could表示_____，而be able to通常表示通过努力达成的_____; can/could 主要是一般现在、一般过去时, 而be able to有较为丰富的时态变化。 习惯性具备的能力 一次性的能力 Explanation The man can/could speak two foreign languages. 那个人能说两门外语。 We can’t carry the heavy box. 我们搬不动那个重箱子。 It can’t be the headmaster. He has gone to America. 这不可能是校长，他去美国了。 It can be very hot here in summer. 这里夏天有时会很热。 Can/Could you give me a cup of tea, please 请给我一杯茶好吗 —Can I use your phone 我可以用一下你的电话吗 —Of course you can. 当然可以。 Study the grammar ... ...
