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课件网) UNIT 2 Let’s celebrate! Using language Learning Objectives To know the usage of the modal verbs: can, could,may, might,must+v原 To know the usages of the modal verbs:can, could, may, might, must be doing To know the usage of the modal verbs:can, could, may,might, must+ have done 情态动词(2) 自主探索 观察以下教材原句并思考黑体部分的功能。 1．As parents, they try to keep that magic alive for their children for as long as they can. 2．Who could it be from 3．The children must have been very excited as they opened it. 4．Interestingly, the letters did not contain the usual warnings to children that they might not receive their presents if they were not good. 5．By expressing love for his children in such a special way, Tolkien may indeed have been the real Father Christmas. [归纳填空] can could; might must have been; may have been （1）. 表示能力：can表示现在的能力，could(can的过去式）表示过去的能力。 She can swim very fast. When I was young, I couldn’t play basketball. （2）. 表示请求和许可：could表示更委婉的语气，回答时只能用can。 —Could I borrow your pen → 礼貌请求 —Yes, you can. can和could (3)表示推测，意为“可能”。多用于否定句或疑问句,could比can可能性更小。 注意：表示推测、许可时，could不代表过去，could 和can 没有时间上的差别。 —Can he be in the reading room now —No, he can't be in it. Because I saw him in the office just now. ———他现在可能在阅览室吗？ ———不，他不可能在(阅览室)。因为我刚刚在办公室看见他了。(现在) It's so late. They can't be reading in the library. 这么晚了，他们不可能在图书馆里看书。(此刻) He can't have gone to Shanghai for I saw him a minute ago. 他不可能去了上海，因为我刚才还看到他了。(过去) (4)表示理论上或习惯上的可能性，意为“可能会”。 Smoking can be harmful to the health. 吸烟有害健康。 即学即练1 选出下列句中can/could的含义 A.表示能力` B.表示推测 C.表示请求和许可 D.表示理论或习惯上的可能性 ①In my opinion, he can't be so rude._____ ②I can speak English fluently while he can't._____ ③Scotland can be very warm in September._____ ④—Could you please clean this room —Yes, I can._____ B D A C (1)表示征求对方的许可或允许(不用might)对方做某事。 —May I come in —Yes, you may/can.(No, you can't.) ———我可以进来吗？ ———是的，你可以进来。(不行，你不能进来)。 You may go now.你现在可以走了。 may和might (2)表示推测(把握不大)，意为“可能”，多用于肯定句。might比may可能性更小。 Today is Sunday. She may not be in the office. 今天是周日。她可能不在办公室。(现在) They might be holding a meeting in the classroom. 他们或许正在教室开会。(此刻) —What has happened to George —I don't know. He may have got lost. ———乔治发生了什么事？ ———我不知道。他可能迷路了。(过去) (3)may用于祈使句，表示祝愿。 May you have a long and fruitful marriage. 祝你们婚姻长久美满。 (4)“may/might as well＋动词原形”表示“不妨，不如”。 I may/might as well start at once. 我还不如马上就动身。 即学即练2 选出下列句中may/might的含义 A.表示许可 B．表示推测 C．表示祝愿 ①She was ... ...
