must-、have-to-区别及专项练习.docx

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:Lmust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 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" have to来 回答。而不用mustift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 neednt/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。）（2）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：Fve got to leave fbr 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 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doiTt/doesn" /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：厂We don't have to go home.厂Do you have to go home?We haven't got to go home.Have you got to go home?专项练习11 .Must I do it now?No, you.A. needn't B. don't have to C. mustn't D. A or B2It's nearly seven o'clock- Jack be here at any time.A. must B. need C should D can.3. When can I come for these photos? I need them tomorrow afternoon.They be ready by 12:00.A. can B. should C. might D. need4. They do well in the exam.A. can be able to B. be able to C. can able to D. are able to5. -Could I take this book out?-No, you.A. can't B. couldn't C. needn*t D. aren't6. You go and see a doctor at once because you're got a fever.A. can B. must C. dare D. would7. -Can you speak Japanese?-No, I.A. mustn't B. can't C. needn't D. may not8. Even the top students in our class can't work out this problem, so it be very difficult.A. may B. must C. can D. need9. He isn't at school. I think he be ill.A. can B. shall C. must D. has to10. The children play football on the road.A. can't B. can C. mustn't D. must1 l.His arm is all right. He go and see the doctor.A. has not to B. don*t have toC. haven't to D. doesn't have to12. Excuse me.you please pass me that cup?A. Do B. Should C. Would D. Must13. -Would you like to go boating with us?-Yes,.A. rd like B. I want C. Td like to D. I do