（精品文档）情态动词ppt

（精品文档）情态动词 第十二讲 语法专题五 情态动词的用法: : Step one: Previewing Test: ? 1.你知道的情态动词有哪些, 你知道的情态动词有哪些, 你知道的情态动词有哪些 ? 2.表请求许可的情态动词有哪些, 表请求许可的情态动词有哪些, 表请求许可的情态动词有哪些 ? 3.表推测的情态动词有哪些, 表推测的情态动词有哪些, 表推测的情态动词有哪些 Step twoTeaching aims: ? 情态动词的用法 Step Three Study again by leading: 1.can的用法有哪些, 的用法有哪些, 的用法有哪些 ?表示能力 “能，会” eg: He can speak a little Japanese. 可以” ?表示请求或许可 “可以”，用于各种人称 eg: Can I help you? 在肯定句表理论的推测,不涉及某事是否会发生 ?在肯定句表理论的推 测 不涉及某事是否会发生 , 关键词sometimes 关键词 e.g. It is usually warm in my hometown in March, but it can be rather cold sometimes. ? 2.may 的用法: 的用法: 可以”“准许” ”“准许 表示请求或允许 “可以”“准许” 常 用于第一人称 eg: May I go home，please? ， ? ? ? ? ? ? ? 3. must的用法: 的用法: 的用法 1)表示义务、必要或命令 “必须、应该” 必须、应该” )表示义务、 eg: You must come early tomorrow( ( 2)must not 禁止，不许 禁止， ) eg: You must not tell lies. 3) “非得, 偏偏? “非得 偏偏? 非得, Must you make such a noise? ? 注意: must开头的疑问句，其否定回答通常用 注意: 开头的疑问句， 开头的 疑问句 _________________ don't have to 或needn't 。而不用 而不用 mustn't ? eg: ---Must I finish my homework first? ? ---No, you _________. 4. need 1)既可作实义动词，又作情态动词。need作情态动 1)既可作实义动词，又 作情态动词。need作情态动 既可作实义动词 词挥糜谝晌示?疑问句， 词只用于疑 问句，否定句和条件句 2)实义动词 实义动词:need+ 2)实义动词:need+ n. / to do sth 情态动词: need，只用原形need后加do need后加do， 情态动词: need，只用原形 need后加do，否定形 式为need not。 式为need not。 你今天下午不必来。 你今天 下午不必来。 eg: You needn't come here this afternoon. You don?t need to come here this afternoon. 我今天下午需要来吗, 我今天下午需要来吗, Need I come here this afternoon? Do I need to come here this afternoon? 3) need 的被动含义: 的被动含义: need, want, require, 后面接 后面接doing need doing = need to be done 这块手表需要修理 The watch needs repairing. The watch needs to be repaired. Need you…?Yes, I must. No,I needn„t Must you…?Yes, I must. No, I needn?t. /don?t have to. ? ? ? ? ? ? 5.征求许可或给予许可的句子有哪些 征求许可或给予许可的句子有哪 些? 征求许可或给予许可的句子有哪些 Can /Could I/you...?” May/Might I…? Will/Would you…? Shall I/he…? “Could/Might /would ...?”如何做出回答, ...?”如何 做出回答 如何做出回答, Could I …? ----Yes, you can./----No, you can?t. Might I…? ---Yes , you may. /No,you mustn?t/you can?t Would you do me a favor? Yes, I will. Step Four Training and Testing David, you _____play with the valuable bottle, you_______ break it. A. won?t; can?t B. mustn?t; may C. shouldn?t; must D. can?t; shouldn?t ----When can I come for the photos? I need them tomorrow afternoon. ----They _______ be ready by 12:00. A. can B. should C. might D. need 1.The photos should be ready tomorrow morning. 2. It should be fairly easy to get her to agree. 3.There shouldn?t be any difficulty about getting you a visa. Naturally, after I told her what to do, my daughter ____ go and do the opposite! A.may B. can C. must D. should ---I don?t mind telling you what I know. ---You______. I?m not asking you for it. A.mustn?t B. may not C. can?t D. needn?t “The interest ______ be divided into five parts, according to the agreement made by both sides, ” declared the judge. A. may B. should C. must D. shall Shall 可以用在条约、协 议、法令等文件中， 可以用在条约、协议、法令等文件中， 表示义务或规定，一 般用于第三人称， 表示义务或规定，一般用于第三人称，意 必须” 为“应， 必须”。 look at the time._______ you play the piano at such a late hour? A. Must B. Can C. May D. Need The World Wid