must 、have to 区别及专项练习
- 格式：doc
- 大小：22.50 KB
- 文档页数：2
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:表示“必须”、“应该”。
例如：
①We must protect our environment.(我们必须保护环境。
）
②Everyone 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：
①You mustn’t speak like that.(你不应该像那样讲话。
）
②You 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’t have to来回答。
而不用mustn’t来回答。
例如：
①——Must I be home before 8 o’clock(8点之前我必须回家吗)
——Yes, you must. No, you n eedn’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：
①He has to stay in bed for 3 or 4 days.(他必须卧床休息三四天。
）
②We 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：
①I’ve got t o 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。
①I must go now.(主观看法)
② 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：
①We don’t have to go home.①Do you have to go home
②We haven’t got to go home. ②Have you got to go home
专项练习1
I do it now
-----No, you _______.
A. needn’t
B. don’t have to
C. mustn’t
D. A or B
’s nearly seven o’clock. Jack ______be here at any time.
A. must
B. need C should D can.
can I come for these photos I need them tomorrow afternoon.
-------They ____be ready by 12:00. A. can B. should C. might D. need
___ do well in the exam.
A. can be able to
B. be able to
C. can able to
D. are able to
5, -Could I take this book out
-No, you___.
A. can't
B. couldn’t
C. needn't
D. aren't
6. You___ go and see a doctor at once because you're got a fever.
A. can
B. must
C. dare
D. would
you speak Japanese
-No, I____.
A. mustn't
B. can't
C. needn't
D. may not
8. 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. need
9. He isn't at school. I think he ___ be ill.
A. can
B. shall
C. must
D. has to
10. The children___ play football on the road.
A. can't
B. can
C. mustn't
D. must
arm is all right. He___ go and see the doctor.
A. has not to
B. don't have to
C. haven't to
D. doesn't have to
12. Excuse me. ___ you please pass me that cup
A. Do
B. Should
C. Would
D. Must
13. -Would you like to go boating with us
-Yes, ___.
A. I'd like
B. I want
C. I'd like to
D. I do。
