Have to与 must区别区别1：must多表示主观需要或责任感的驱使有必要或有义务去做某事，多译为“必须”，have to多表示客观存在的环境所限,即客观要求(无奈)而为之，多译为“不得不干某事”。I must clean the room because there are too dirty.（无人强迫） 因为太脏了，我必须要打扫房间。 We must be there on time. （责任感的驱使）我们一定准时到达。 I have to do my homework now.（不得不做） 我现在不得不做作业。 I have to leave school because my family is poor now.（无奈） 因为家里穷了，我不得不退学。 I have to stop smoking .(外界压力，客观情况使然)I must stop smoking.（主观认为）区别2：must没有时态的变化，he must 或she must have to有时态的变化。 have to/ has to/ had to/will have toDaming was hurt. The doctor said he had to stay in hospital for about two weeks. His father has to go to take care of him. 大明受伤了。医生说他大概得住院两周，他的父亲得去照顾他。 We dont have to go to school on Sundays. 星期天我们不必上学。 区别3：must的否定: 借助助动词do或does, 即dont或doesnt 而不是mustnt, 表示“禁止，命令”,与“必须，一定”没有任何关系。 例：No!You mustnt turn left! You must turn right into The Strand. 不！你不能向左转！你应该向右转进入到strand中。 must引起的疑问句, 肯定回答要用-must. 否定回答要用-neednt或dont (doesnt) have to，意思是“不必”. 1）Must I finish my homework before eight oclock? Yes, you must. 我必须要在8点之前完成作业吗？ 是的，必须。 2） Must I attend the meeting? No, you neednt/dont have to. You can ask Tom to go instead. 我必须要参加这次会议吗？ 不。你不必。你可以让汤姆替你去。 have(has) to 否定的疑问，否定均须借助于do/does。 He doesnt have to finish his homework. Does he have to go there now ? Yes, he does/No,he doesnt 注意：Does he have to go there now? 不说 Has he to go there now? 专练： 用have/has to和must填空 1. Its raining now, he _ stay at home. 2. Must I finish my homework?No, _. A. You mustnt B.you must C.you neednt D.you dont 3. He has to go home (改为否定句)_. (改为一般疑问句)_? Yes,_./No,_. 4. We must go there at eight. (改为否定句)_. (改为一般疑问句)_? Yes,_./No,_.