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课件网) Unit 5 The Value of Money Discovering Useful Structures ———Express modality and talk about future events in the past 情态动词&过去将来时 1. To learn about the different functions of modal verbs. 2. To be able to talk about future events in the past using “would do” and “was / were going to do”. Leading-in May we ask what you're doing in this country and what your plans are I can't say that I have any plans. You mustn't worry about that. Could you offer me work here Read the sentences below and think about: What are the functions and meanings of these modal verbs I. Review of modal verbs 一、情态动词的语法特征 情态动词可以表示可能、建议、愿望、必要、 允许、能力等。 2.情态动词没有人称和数的变化。 3.情态动词必须和实义动词一起构成谓语。 4.情态动词除ought和have外，后面只能接不带to的不定式。 5.情态动词没有非谓语形式，即没有不定式、分词等形式。 Modal verbs have many functions as follows: A. necessity B. possibility C. obligation D. request E. advice F. intention 需要 可能 职责/义务 要求 建议 意图 情态动词的功能 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 shall/should, will/would have to, used to 情态动词 否定式 缩略形式 can could may might shall should 情态动词 否定式 缩略形式 will would must needn’t don’t have to mustn’t表示“禁止，不允许 had better ought to can not/ cannot can't could not couldn't may not / might not mightn't shall not shan't should not shouldn't will not would not need not do not have to had better not ought not to won't wouldn't oughtn't / 1. 表示能力，常译为“会，能”。can表示现在的能力，could表示过去的能力。 He can ride a bike now, but he couldn’t a few weeks ago. 2. 表示可能性。can多用于否定句和疑问句中，但也可用在肯定句中；could表示过去的可能，多用于间接引语中。 1) That can’t be Mary — she has gone to school. 2) I told the boss that I couldn’t finish the work in such a short time. 一、can/could 3. 表示请求或允许，译为“可以”。表示此意时，用could语气更委婉。 - Can/Could I borrow your bike - Yes, you can. 【拓展】 1) 表示惊讶、怀疑、不相信的态度 (主要用于否定句、疑问句和感叹句中)。 Can hard work change a person that much 2) can亦可表示“有时会”。 You can be very naughty. 1. 表示说话人的猜测，意为“或许；可能”。might表示的可能性比may小。 You’d better take an umbrella. It may/might rain. 2. 用来提出问题，问可不可以。用might时语气更委婉。 Might/May we use your typewriter for a little while 3. 表示“可以”。作此用法时，might是may的过去式。 1) You may come if you wish. 2) The boy asked his mother if he might go to play basketball. 二、may/might 1. 表示习惯性动作。will指现在，would指过去。 1) Fish will die without water. 2) He would get up early when he lived in the country. 2. 表示请求、建议等。用would比用will委婉、客气。 Will/Would you please pass me that book 【拓展】 表示意愿或意志。will表现在，would表过去。 1) I will help you if you need me. 2) He said ... ...
