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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 CONTENTS: 1. The characteristics of modal verbs 2. List of modal verbs 3. Usage of modal verbs 4. Example of modal verbs 1. The characteristics of modal verbs Modals are special verbs that behave irregularly in English. ①They are different from normal verbs like "work, play, visit..." ②They give additional information about the function of the main verb that follows it. They have a great variety of communicative functions. 1. The characteristics of modal verbs A. They never change their form. You can't add "s", "ed", "ing"... 没有人称、数及时态的变化 They are always followed by an infinitive without "to" (e.i. the bare infinitive.) 后加动词原形 They are used to indicate modality and allow speakers to express adding meanings. 表达情感和态度 2. List of modal verbs （9） M M M W W C C S S ust ay ight ill ould an ould hall hould dare/need not/ought to/have to/ you’d better 3. Usage of modal verbs Modal verbs are used to express functions such as: 许可 能力 义务；责任 禁令 不必要 建议 可能性 概率 Permission Ability Obligation Prohibition Lack of necessity Advice possibility probability 1. The characteristics of modal verbs A. They never change their form. You can't add "s", "ed", "ing"... 没有人称、数及时态的变化 They are always followed by an infinitive without "to" (e.i. the bare infinitive.) 后加动词原形 They are used to indicate modality and allow speakers to express adding meanings. 表达情感和态度 2. List of modal verbs （9） M M M W W C C S S ust ay ight ill ould an ould hall hould dare/need not/ought to/have to/ you’d better 3. Usage of modal verbs Modal verbs are used to express functions such as: 许可 能力 义务；责任 禁令 不必要 建议 可能性 概率 Permission Ability Obligation Prohibition Lack of necessity Advice possibility probability 4. 相当于情态动词的: 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: 三、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 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 ... ...
