must-、have-to-区别及专项练习.doc

word完整版)must 、have to 区别及专项练习
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：
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 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：
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 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。
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?

练习:

专项练习1
1.————Must I do it now？
--—-—No， you _______.
A。 needn’t B. don’t have 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____。
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
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