情态动词课件 2023届高考英语一轮复习

情态动词 情态动词有哪些？ must, can(could), may(might), ought to, shall(should), will(would), have(had) to, need, dare, have to, had better. 情态动词本意 01 can, could 能力 　　Can you lift this heavy box? 　　Mar can speak three languages. 　　Can you skate? be able to do The baby will be able to walk in a few weeks.( 将来的能力) The fire was very big, but most people were able to escape from it. (过去某时某一场合设法做成了某事) 2. 表示请求和允许。 　　-----Can I go now? 　　----- Yes, you can. / No, you can't. 　　---- Could I come to see you tomorrow? 　　---- Yes, you can. ( No, I'm afraid not. ) 3. 表示客观可能性。(多用于肯定句) 　　It can be very hot in our ciry in summer. Anyone can make mistakes. can't... too/enough: 无论怎样...都不过分，越来越好 You can't be careful enough to across the road. = You can't be too careful to cross the road. You can never do the work too well. can't help it:无计可施 I couldn't help it if the bus was late. can't help doing:情不自禁 may, might 1. 表示请求和允许。 　　----Might/ May I smoke in this room? 　　---- No, you mustn’t. 　　---- May/Might I take this book out of the room? 　　---- Yes, you can/may. (No, you can’t / mustn’t. ) May I...？征徇对方许可时比较正式和客气。 2. 表示祝愿。 　　May you succeed! May all your dreams come true. may/might as well: 最好...，不妨 You may as well stay where you are. may well: 很可能...(be very likely to) Her appearance has changed so much that you may well not recognize her. must 1. 表示必须、必要。 　　You must come in time. 　　 　　---- Must we hand in our exercise books today? 　　---- Yes, you must. 　　---- No, you don’t have to / you needn’t. 2. 偏偏，非得要 Must you waste so much time? If you must smoke, please go outside the room. 3. 表示强调（口语） I must say, you are looking extremely well. must/have to Must是说话人的主观看法， 而have to则强调客观需要。 have to 有更多的时态形式。 Shall/should shall: 1) shall 用于第一人称，第三人称，征求对方的意见。（问句） 　　What shall we do this evening? 2) 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。（陈述句） 　　1. You shall fail if you don’t work hard.(警告) 　　2. He shall have the book when I finish it.(允诺) 　　3. He shall be pun