(完整版)must_、have_to_区别及专项练习.doc

must与have to的区
情 must 和 have to 都有“必”的含，它的用法如下：
（一）、must “必”、“ ”的用法 :1.must表示“必”、“ ”。

例如：
①We must protect our environment.( 我必保境。

）
②E veryone must obey the rule. （人人必遵守制度。

）
2.must 的否定形式 must not 表示“不”、“禁止”、“不准”。

气比烈。

例如：①You mustn ’
t speak like that你.(不像那。

）
②Y ou mustn ’ t be late for school（.你不上学到。

）
3.在回答 must 的句，肯定形式用 must 来回答，但否定形式用 needn ’或t 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点之前我必回家？)
—— Yes, you must.No, you needn’ t./No, you don’ t have to.
（是，你必。

）（不，你不必。

）
（二）、 have to表示“必”、“不得不”，例如：
①H e has to stay in bed for 3 or 4 days.( 他必卧床休息三四天。

）
②We will have to get up early tomorrow. （明天我必早起。

）
充： have got to 是 have to 的口形式。

例如：
① I ’ ve got to leave for Nanjing.我(不得不去南京。

)
* Must 与 have to 的区：
must 表示的是人的主看法，而have to 表示的是客需要。

Must 一般只有在，
而 have to 有更多的形式。

①I must go now.( 主看法 )
② My mother is ill, so I have to go now.(客需要)
* Have to 与 have got to 的区：
have got to 然是 have to 的口形式，但二者在用法上有格的区：have to 的前面可以用情或助，而 have got to 却不可以； have to 的否定形式 don’t/doesn ’t /didn ’t +have to, 疑式Do/Does/Did + 主 + have to ⋯?而 have got to 的否定形式是在 have 后加
not, 疑式把have 提前。

例如：
①We don’ t have to go home.①Do you have to go home?
② We haven ’ t got to go home.②Have you got to go home?
专项练习 1
1.----Must I do it now?
-----No, you _______.
A. needn’t
B. don’thave to
C. mustn’t
D. A or B
2.It’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. need
4.They ___ 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
7.-Can you speak Japanese?
-No, I____.
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
11.His 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。