33Unit1章节幻灯片.pptVIP

must和 have?to 1.must用于一般问句中,肯定回答用must否定式用?needn’t或don’t have to，做?“不必”,mustn’t表示“禁止，不允许” ?— Must?I?finish?all?assignments?at?a?time? ??—Yes, you must. No,?you?neednt. I don’t like this TV set. We must buy a new one. There was no more bus. They had to walk home. 2.表示“必须”这个意思时，must?和have?to?稍有区别。must着重说明主观看法，have?to?强调客观需要。另外，have?to?能用于更多时态。 ?You?must?be?the?new?teacher. ? He?must?be?joking. There?is?nobody?here.?They?must?have?all gone?home. 3.must表示对某人某事的猜测，?作“准是”，“一定” ，一般用于肯定句中。对过去发生的事情作肯定判断用must have done He must come and worry her with question, just when she was busy cooking the dinner. Of course，after I gave her my advice，she must go and do the opposite. 4. must表示“偏要，硬要”，指做令人不快的事情 ----____ 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 Practice 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. A. can’t have been B. couldn’t be C. may have been D. would be A 4. How ____ you say that you really understand the whole story if you have covered only part of the article? A. can B. must C. need D. may A 5. There ____ be any difficulty about passing the road test since you have practised a lot in the driving school. A. mustn’t B. shan’t C. shouldn’t D. needn’t C 6.---There were already five people in the car but they managed to take me as well. ---It ____a comfortable journey. ( ) A. cant be B. mustnt have been C. shouldnt be D. couldnt have been D 7.The fire spread through the hotel very quickly but everyone ___ get out. ( ) A. had to B. would C. could D. was able to