m4u2 Grammar简化.ppt

General introduction We use modal verbs to talk about ability, obligation (责任，义务 ) , certainty (确定) and permission（允许）. We also use modal verbs to make requests, suggestions, offers and give advice. Find out the usage of the following structures must + be doing can/may + be doing could + have done must + have done couldn’t + have done should + have done needn’t + have done Have a try ______________________________(他可能已经去上海了). But I’m not sure. ________________________（他一定已经去上海了), because he said if he wasn’t at work , that’s where he would be. __________________________(他不可能已经去上海了). I saw him just now in the library. Have a try ___________________________.(我本应该早点离开这里的) __________________________________(你刚才没有必要浇花的).Look, it’s going to rain now. ___________________________________________(你昨天晚上一定看过比赛了), or you can’t know the result clearly. Consolidation Exercise 1. I thought you _____like something to read, so I have brought you some books. A. may B. might C. would D. must 2. We____ booked. Look, the restaurant is almost empty! A. must have B. can’t have C. should have D. needn’t have 3. I didn’t hear the phone. I ___asleep. A. must be B. must have been C. should be D. should have been Consolidation Exercise 4.----There were already five people in the car, but they managed to take me as well. ----It ____a comfortable journey． A. can’t be B. shouldn’t be C. mustn’t have been D. couldn’t have been * * * * Fill in the blanks with correct modal verbs: 1. Simon: If you ______ (can/ must) finish the work today, you ______ (shall/must) have two days off from tomorrow. Ron: I often work overtime, but I seldom get extra time off. Simon: But this time is different, I promise. Ron: Ok. I ______ (will/need) do my best. If