unit1-grammer肖云(已改無錯字)
2022-08-21 15:51:52 本頁面
【正文】 ___, choose a seat in the smoking section. B. could C. may D. must 2). John, look at the time. ____ you play the piano at such a late hour? A. Must B. Can C. May D. Need You must be tired after such a long walk. He must be sleeping now. There is nobody here. They must have all gone home. , 作“準(zhǔn)是” , “一定” , 一般用于肯定句中。對過去發(fā)生的事情作肯定判斷用 must have done must do/be 現(xiàn)在肯定猜測 must have done 過去肯定猜測 can /could do/be 現(xiàn)在否定 ,疑問猜測 can /could have done 過去否定，疑問猜測 may/might do/be 現(xiàn)在肯定猜測 may/might have done 過去肯定猜測 如： We mustn’t waste our time. May I take this magazine out? No, you mustn’t. 注意 : must not : “禁止” 。 must用于一般問句中 ,肯定回答用 must否定 回答 用 needn’t或 don’t have to， — Must I finish all assignments at a time? — Yes, you must. No, you needn39。t. /don’t have to. I don’t like this TV set. We must buy a new one. There was no more bus. They had to walk home. 表示“必須”這個意思時， must 和 have to 稍有區(qū)別。 must著重說明主觀看法， have to 強調(diào)客觀需要。另外， have to 能用于更多時態(tài)。 must和 have to 1. ____ I go out to play, mum? No, you___. You should do your homework first. A. Might。 wouldn’t B. May。 had better not C. Must。 mustn’t D. Need。 mustn’t B 2. Where is Emma? I can’t say for sure where she is, but she___ be out shopping. A. can B. should C. must D. may D 3. The room is in a terrible mess。 it ____ cleaned.
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