1、8B unit4 A good read,Grammar(2),一.用“疑问词不定式”改写下列句子。 1.How we should do it was discussed last night. _ was discussed last night. 2. I didnt know where I should go. I didnt know _. 3. The difficulty was how we should cross the river. The difficulty was _ . 二. 根据汉语补全下列英语译文。 4. 何时动身还不知道。 _ is unknown. 5.
2、 我忘了该怎么办。 I forgot_. 6. 我可以告诉你哪里可以买到此书。 I can tell you_.,How to do it,where to go,how to cross the river,When to start,what to do,where to buy(get) this book,1. Mum, may I watch TV now?No, you _ finish your homework first. A. mustnt B. must C. have to D. cant2. Must I finish that work today?No, you
3、_. You may finish it in three days. A. shouldnt B. neednt C. mustnt D. hadnt to3. Yesterday it rained heavily when school was over. We _ stay in our classroom. A. must B. should C. had to D. need4. I cant stop playing computer games.For your health, Im afraid you _. A. can B. may C. must D. have to5
4、. What did the headteacher say at the meeting?He said, “We _ be proud of working hard. We mustnt be lazy.” A. must B. neednt C. may D. cant,B,B,c,D,A,Conclusion:,一、must 的用法 1、表义务，“必须”。 2、在否定结构中表示“不许，禁止” 3、表推测，暗含有很大的可能性。 4、关于must的简短回答。 -Must I clean the room at once? -Yes,you must. -No,you neednt/No,
5、you dont have to.不，你不必。/不，你不需要。,二、have to 的用法：have to 表客观的需要和义务，must表主观的认识。,他得做那件事吗？,Did he have to do it ?,Must he do it?,在疑问句和否定句中， have to 多用助动词do 构成， must则直接提前或加not.,你不需要去那儿。你不允许去那儿。,You dont have to go there.,You mustnt go there.,在否定句中， dont have to 表不需要， mustnt 表不允许。,Finish the exercise on p56
6、.,一、请用must, need或have to的适当形式填空。 1. Ill _ look after my sister at home this Sunday. 2. You _ go outside to play as it is snowing heavily. 3. We _ be polite to our teachers at school.,Practice,have to,mustnt,must,4. I got up late this morning, so I _ take a taxi to school. 5. Does she _ stay at home? No, she doesnt. 6. Must I get to the station before 5 p.m.? Yes, you _. / No, you _.,had to,have to,must,dont have to / neednt,
