must_、have_to_区别及专项练习(6页).doc

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1、- 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 mustnt speak like that.(你不应该像那样讲话。） You mustnt be late for school.（你不应该上学迟到。）3.在回

2、答must的问句时，肯定形式用must来回答，但否定形式用neednt 或dont have to来回答。而不用mustnt来回答。例如： Must I be home before 8 oclock?(8点之前我必须回家吗？) Yes, you must. No, you neednt./No, you dont 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。） We will have to get up early tomor

3、row.（明天我们必须早起。） 补充：have got to是 have to的口语形式。例如： Ive 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 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

4、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dont/doesnt /didnt +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 dont have to go home. Do you have to go home? We havent got to go home. Have you got to go home?专项练习11.-Must I do it now?-No, you _. A.

5、 neednt B. dont have to C. mustnt D. A or B2.Its nearly seven oclock. 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

6、 to B. be able to C. can able to D. are able to5, -Could I take this book out? -No, you_. A. cant B. couldnt 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_. A. mustnt B. cant C. neednt D. may not8. Ev

7、en 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 to C. havent to D. doesnt 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. Id like B. I want C. Id like to D. I do第 6 页-