情态动词最基本用法 why

情态动词最基本用法
1. can/ could/ be able to
1) I can sing this song.
I am able to arrive at school on time in spite of the heavy rain.表能力
2) Can/ Could I borrow your car? 表请求、许可（回答用can不用could）
3) Peter can be really difficult at times, even though he is a nice person in general.
It can be windy in Jiaozuo, especially in spring.有时会
4) You can’t be too careful.
I cannot thank you enough.无论…也不过分，越…越好
练习：
1) Black holes ___not be seen directly, so determining the number of them is a tough
task.
A. can B. should C. must D. need
2) It is usually warm in my hometown in March, but it ___be rather cold sometimes.
A.must B. can C. should D.would
2. may/ might
1) –May I come in?
--Yes, you may/please. / --No, you may not./ you’d better not.表请求，许可（回
答用may不用might）
2) May you succeed!表祝愿
3) If there’s a chance, I may/might as well have a try.做…也无妨，最好
It may well（ not）be true.很可能（不）
练习：
–Might I watch TV after supper?
--Yes, you ___.
A. may B. must C. might D. can
3.must
1) You must do it now! / You needn’t do it./ You don’t have to.
We must study English, needn’t we? 表义务
2) You mustn’t do it.表禁止
3) –I want to go now.
--If you must, at least wait till the rain stops.“非要，一定要”
练习：
1) In crowded places like airports and railway stations, you ___ take care of your
luggage.
A. can B. may C. must D.will
2) John, look at the time. ___ you play the piano at such a late hour?
A. Must B. Can C. May D. Need
4.should/ ought to
1) You should work harder./What should I do?“应该”（义务、做某事正确明智、
征求或提供建议）
2) It is surprising that Tom should fall in love with Jerry.
How/ Why should you be so late today?“竟然”
3) Should it rain tomorrow, I would not go out. “万一”
练习：
1) –I think I’ll give Bob a ring.
--You ___. You haven’t been in touch with him for ages.
A. will B. may C. have to D. should
2) You can’t imagine that a well-behaved gentleman ___ be so rude to a lady.
A. might B. need C. should D. would
5. shall
1) I shall be 18 next year. 第一人称表将来
2) Shall we go now? 一三人称表建议
3) You shall have the book when I finish it.二三人称表命令，警告，允诺，威胁
4) –Can I pay the bill by check?
--Sorry, sir. But it is the management rules of our hotel that payment shall be
made in cash.用于规章制度中
练习：
1) –What is its name?
--Khulaifi. ___ I spell that for you?
A. Shall B. Would C. Can D. Might
2) –Excuse me, but I want to use your computer to type a report.
-- You___ have my computer if you don’t take care of it.
A. shan’t B. might not C. needn’t D. shouldn’t
6. will/would
1) The weather will be fine.表将来，“会”
2) –What a heavy box!
--Don’t worry, I will help you.说话临时决定
3) – Will you marry me? Yes, I will.表请求或意愿
4) The door won’t open.“门打不开”
5) Would表过去将来，表过去的习惯，或疑问句征求对方意见
练习：
1) –What’s wrong with your pen?
--The ink ___ come out.
A. won’t B. didn’t C. hasn’t D.can’t
2) John promised his doctor he ___ not smoke, and he has never smoked ever since.
A. might B. should C. could D.would
7. need
You needn’t finish it today.
练习：
1) –What sort of house do you want to have ? Something big?
--Well, it be big--that’s not important.
A. mustn’t B. needn’t C. can’t D. won’t
8. would/ used to
共同点：
1. When we were young, we used to/ would go swimming every summer.
2. I would / used to go to France six times.
3. He would / used to live in Jiaozuo for 20 years.
区别：
1. He is not what he used to be.
There used to be a park.
2. People used to believe that the earth is flat.
He would go to the park as soon as he was free.
3. when I get into trouble, he would always help me.