unit-1情态动词用2.pptVIP

策划：《学生双语报》 3.在疑问句中 Could 比can 更有礼貌，在此不是can的过去式。 Can/Could you wait a moment please? ---Could you lend me some money? --- Yes, I can . could 表请求，语气委婉，其答语用can 4. Can 表可能性 ,在肯定句中是理论上 的可能性，不涉及是否真会发生。 Even experts can make mistakes. 4）May 表示许可，表示允许别人做某事， 也可征求对方的许可。 May I open the door? Yes, you may. No, you may not We may keep the book for two weeks. 5） 用于祈使句，表示祝愿。 May you succeed! May you have a nice trip! 6.may 用于让步从句 However hard you may study, you cann’t master English in a month. Shall/should 1.shall 用于第二、三人称，表示说话人给对方的命令，警告，允诺或威胁。 1)You shall go with me.(命令) 2)You shall have the book when I finish it.(允诺) 3)He shall be punished.(威胁) 2. shall用于第一、三人称疑问句中，表示说话人征求对方的意见和向对方请示。 4)Shall we begin our class?（征求意见） 5)When shall Mike be able to leave hospital?(请示) 3.用于条约，法律，规定，规章等文件中，无论人称如何，一律 shall ，表义务、规定 “应该；必须” 6) “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 2. should 的用法 a. should 表示期待，合理的推断或明显的结果，所期待的事几乎是事实。 It is three o’clock,and the football game should begin now. Mary took dancing lessons for years, she should be an excellent dancer. 注意：should可表示“居然，竟然”。 I can’t believe such a gentleman should be so rude to the old. 我不敢相信这样一个绅士居然对老人如此无礼。 dare need Could I borrow your dictionary?(委婉) ---- Yes，you can/may. Sure. Go ahead. Please yourself. May I take this seat?(第一人称疑问句) Yes, you may. No, you mustn’t. 巩 固 练 习 1.---What ____ it be? ---It ____ be a mail box, for it is moving. It ___ be a car. A. can; can’t; must B. can; can; must C. can; mustn’t; must D. must; mustn’t can 2. ---Isn’t that Ann’s husband over there? ---No. it ____ be him---I’m sure he doesn’t wear glasses. A.can’t B. must not C. wont D, may not 3.---When can I come for the photos? I need them tomorrow afternoon. ---They ____ be ready by 12:00. A.