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1、must 与 have to 的区别情态动词must 和 have to 都有“必须”的含义，它们的用法如下：（一）、must “必须”、“应该”的用法:1.must 表示“必须”、“应该”。例如： We must protect our environment.( 我们必须保护环境。） Everyone must obey the rule.（人人必须遵守制度。）2. must 的否定形式must not 表示“不应该”、“禁止”、“不准”。语气比较强烈。例如： You mustn t speak like that.(你不应该像那样讲话。） You mustn t be late for
2、school.（你不应该上学迟到。）3.在回答 must 的问句时，肯定形式用must 来回答，但否定形式用needn t 或 don t have to 来回答。而不用 mustn t 来回答。 例如： Must I be home before 8 o clock?(8 点之前我必须回家吗？) Yes, you must.No, you needn t./No, you don t have to.（是，你必须。）（不，你不必。）（二）、 have to 表示“必须”、“不得不”，例如： He has to stay in bed for 3 or 4 days.(他必须卧床休息三四天。）
3、 We will have to get up early tomorrow. （明天我们必须早起。）补充： have got to 是 have to 的口语形式 。例如： I ve got to leave for Nanjing.(我不得不去南京。)* Must 与 have to 的区别：must 表示的是说话人的主观看法，而have to 则表示的是客观需要。Must 一般只有现在时，而have to有更多的形式。 I must go now.(主观看法 ) My mother is ill, so I have to go now.( 客观需要 )* Have to 与 have
4、got to 的区别：have got to 虽然是 have to 的口语形式，但二者在用法上有严格的区别：have to 的前面还可以用情态动词或助动词，而have got to 却不可以；have to 的否定形式为don t/doesn t /didn t +have to, 疑问式为 Do/Does/Did +主语+ have to?而 have got to 的否定形式是在have后加not,疑问式把 have提前。例如： We don t have to go home. Do you have to go home? We havent got to go home. Have
5、 you got to go home?专项练习11.-Must I do it now?-No, you _.A. needntB. dont have toC. mustn tD. A or B2.It s nearly seven o clock. Jack _be here at any time.A. mustB. needC shouldD can.3.-When can I come for these photos? I need them tomorrow afternoon.-They _be ready by 12:00.A. canB. shouldC. mightD.
6、 need4.They _ do well in the exam.A. can be able toB. be able toC. can able toD. are able to5, -Could I take this book out?-No, you_.A. cant B. couldn t C. neednt D. arent6. You_ go and see a doctor at once because youre got a fever. A. can B. must C. dare D. would7.-Can you speak Japanese?-No, I_.8
7、. Even the top students in our class cant work out this problem, so it_ be very difficult.A. may B. must C. can D. need9. He isnt at school. I think he _ be ill.A. can B. shall C. must D. has to10. The children_ play football on the road.A. cant B. can C. mustnt D. must11.His arm is all right. He_ go and see the doctor.A. has not to B. dont have toC. havent to D. doesnt have to12. Excuse me. _ you please pass me that cup?A. DoB. ShouldC. WouldD. Must13. -Would you like to go boating with us?-Yes, _.A. Id likeB. I wantC. Id like toD. I do
must、haveto区别及专项练习
