情课件态动词.pptVIP

情态动词的用法１ １就某事向某人提出建议或发表自己的观点　 1）you had better be going. 2) Had you better go at once. __Yes, we had better. __No, we had better not. 情态动词的用法2 2 劝说某人做某事或不要做某事，向某人提出忠告：should ought to You ought to start at once. Such things ought not to be done. Ought he to go? Yes ,he ought to. 情态动词的用法3 能够用英语表达做某事的重要性或必要性 have to /has to must . have got to /has got to 情态动词的用法3 能够用英语表达做某事的不重要性或不必要性 do not have to haven’t got to 能够用英语坚决表达某事不可接受或不可取．must not 表示偏要，硬要做某事．must --- how old are you？ --- If you must know, I am twice my son’s age. May I smoke here?----if you____, Choose a seat in the smoking section(.06山东） ３could I have a word with you, mum? ----Oh dear, if you ___. A can B must C 不填 D should verbs Modal verbs “猜测”类情态动词与你同行 大纲要求 能够准确把握情态动词 must can/could /may/might . 例句呈现　领会用法特征 １)you must catch a cold; you have a high fever. 2)He must be doing his homework in the classroom.(正在进行） 3) It must have rained last night, for the ground is wet. 结论 1 must 的把握性最大 ２must 表示推测的否定形式表示“一定不，肯定不”用can’t,　表询问时用can. 3 must既可推测现在 ／正在发生的动作 ／过去发生的动作 习题精选 1 I’m very sorry. I didn’t hear the phone . I _____ asleep. A. must be B. must have been C have to be D. have to have been. 2 This cake is very sweet. You ___a lot of sugar in it. A should put B could have put C Might put D must have put Can 的用法 1) The professor can’t be there now. 2) Can he still be alive after all these years. 3)They can’t be reading in the library. 4) He can’t have gone to Shanghai for I saw him a moment ago. 5) can he have gone to his aunt’s? 4/5 （对过去发生的行为的怀疑和不肯定，通常用在否定句和疑问句中） Can 的结论 1)?表推测时通常用于否定或疑问句中． 2）Can’t“一定不 ”语气非常肯定，can 在疑问句中表“会，可能” 3) can/can’t 后可接进行时或完成时，表对现在或过去动作的推测 思考:can 能用在肯定句中表推测吗？could 可以吗? 特殊情况 注意： 1（ＮMET2003,28) A left-luggage office is a place where bags _can_ be left for a short time, especially at a railway station　　　　　　　　2Accident can happen on such rainy days. （客观可能性） ３(NMET1993 27) Peter may come with us tonight,