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1、情态动词,一、must,1) 表示“必须、必要”，是说话人的主观看法。 You must come in time. 在回答引出的问句时，如果是否定的， 不能用mustnt（禁止，不准），而用neednt, dont have to（不必）. Must we hand in our exercise books today?,2) 表示推测、可能性（只用于肯定的陈述句） Youre Toms good friend, so you must know what he likes best. Your mother must be waiting for you now.,二、Might and
2、 may,1)表示请求和允许。might比 may语气更委婉，而不是过去式。 否定回答时可用cant 或mustnt，表示“不可以，禁止”。 -Might/ May I smoke in this room? - No, you mustnt. - May/Might I take this book out of the room? - Yes, you can. (No, you cant / mustnt. ) 用May I.?征徇对方许可时比较正式和客气，而用Can I.?在口语中更常见。,2) 表示推测、可能性（不用于疑问句）。,might不是过去式，它所表示的可能性比may小。 H
3、e may /might be very busy now. Your mother may /might not know the truth.,三、can, could,1) 表示能力（体力、知识、技能）。 Can you lift this heavy box?（体力） Mary can speak three languages.（知识） Can you skate?（技能）,2) 表示请求和允许。,-Can I go now? - Yes, you can. / No, you cant. 此时可与may互换。在疑问句中还可用could, might代替，不是过去式，只是语气更委婉，
4、不能用于肯定句和答语中。 - Could I come to see you tomorrow? - Yes, you can. ( No, Im afraid not. ),3) 表推测可能性。,肯定句中：can表示理论上的可能性；may表示事实上的可能性，如： In Yuyao, sometimes it can be really cold. Tom may go camping with us tomorrow, but he is not sure. 否定句和疑问句中，只能用can表猜测可能性。 Someone is knocking at the door, and who can
5、 it be? It cant be Tom because he has gone to Beijing.,四、 shall,shall 用于第一人称，征求对方的意见。 What shall we do this evening? shall I clean the room for you?,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。 You shall fail if you dont work hard.(警告) He shall have the book when I finish it.(允诺) He shall be punished.(威胁
6、),五、should,表示“应该”，常用来表示劝告、建议；认为“某人应该做某事”或“有义务责任做某事”。 We should obey traffic laws. You shouldnt watch TV every day。 You shouldnt have made this kind of silly mistakes. Tom should have brought his report today. 这时它可以和 ought to， be supposed to 互换使用,2) Should (ought to)表示推测时，是指有一定根据的推测，意为“可能、该”。,-When c
7、an I come for the photos? I need them tomorrow. -They _ be ready by 12:00.,六、 will 和 would,1)表示意志或意愿：决心，愿意， We will do our best to save the child. 我们会尽力抢救这个孩子。 I told her to stop crying, but she just wouldnt listen. 我叫她别哭,可她就是不愿听。,2)表示请求、建议或征求对方意见时，用Would you? 比用Will you?更婉转。如：,Will/Would you please keep the door open? 请让门开着好吗？ Will/Would you go with me?你愿意和我一起去吗?,七、need,need作情态动词无人称或数的变化， 后接动词原形，多用于否定句和疑问句中。 如：You neednt worry.你不必担心 I neednt have brought the raincoat with me in such a sunny day yesterday.,Thank you!,
