议、也可作为实义动词表"意愿、意志、决心"，本题表示决心，选B。
5.3.13 带to 的情态动词
带to 的情态动词有四个：ought to, have to, used to, be to, 如加上have got to （=must）, be able to，为六个。它们的疑问、否定形式应予以注意：
Do they have to pay their bill before the end of the month?
She didn't use to play tennis before she was fourteen.
You ought not to have told her all about it.
Ought he to see a heart specialist at once.?
ought to 本身作为情态动词使用。其他的词作为实义动词使用，变疑问，否定时，须有do 等助动词协助。
典型例题
Tom ought not to ___ me your secret, but he meant no harm.
A. have told B. tell C. be telling D. having told
答案A。由于后句为过去时，告诉秘密的动作又发生在其前因，此地应用过去完成时，但它在情态动词 ought to 后，所以用have told。
5.3.14 比较need和dare
这两词既可做实义动词用，又可做情态动词用。作为情态动词，两者都只能用于疑问句，否定句和条件句。need 作实义动词时后面的不定式必须带to，而dare作实义动词用时, 后面的to 时常可以被省略。
1） 实义动词：need（需要, 要求） need + n. / to do sth
2） 情态动词：need，只用原形need后加do，否定形式为need not。例如：
Need you go yet? 你要走了吗？
Yes, I must. / No, I needn't.是的，我要走了/不，不急着走。
5.4 短语动词
动词加小品构成的起动词作用的短语叫短语动词。例如：
Turn off the radio. 把收音机关上。（turn off是短语动词）
短语动词的构成基本有下列几种：
1）动词+副词，如：black out；
2）动词+介词，如：look into；
3）动词+副词+介词，如：look forward to。构成短语动词的副词和介词都统称为小品词。
5.5 助动词练习
1. 1.If it is fine tomorrow, we ______ a football match.
a. have b. will have c. has d. shall has
2. 2.When he was at school, he ______ early and take a walk before breakfast.
a. will rise b. shall rise b. should rise would rise
3. 3.In the past 30 years China ______ great advances in the socialist revolution and socialist construction.
a. has made b. have made c. had made d. having made
4. 4.I ______ go to bed until I ______ finished my work.
a. don’t/had b. didn’t/have c. didn’t/had d. don’t/have
5. 5.______ you think he ______ back by dinner time?
a. Do/have come b. Did/will have come c. Does/will come d. Do/will have come
6. 6.He said that he dropped his bag when he ______ for the bus.
a. was runing b. was running c. were running d. is running
7. 7.No sooner ______ he arrived home than he ______ to start on another journey.
a. has/was asked b. have/were asked c. had/is asked d. had/was asked
8. 8.“______ you give me a room for the night?” I asked on arriving at the hotel.
a. Should b. Can c. Might d. May
9. 9.There are nine of them, so ______ get into the car at the same time.
a. they may not at all b. all they may not c. they can’t all d. all they can’t
10. 10.“We didn’t see him at the lecture yesterday.” “He ______ it.”
a. mustn’t attend b. cannot have attended
c. would have not attended d. needn’t have attended
11. 11.“You realize that you were driving at 100 mph, don’t you?”////文//檔//共//享//與//在//線//閱//讀//
“No, officer. I ______. This car can’t do more than 80.”
a. didn’t need to be b. may not have been c. couldn’t have been d. needn’t have been
12. 12.he was a good runner so he ______ escape from the police.
a. might b. succeeded to c. would d. was able to
13. 13.If they ______, our plan will fall flat.
a. are co-operating b. had not co-operated c. won’t co-operate d. didn’t co-operate
14. 14.I hoped ______ my letter.
a. her to answer b. that she would answer c. that she answers d. her answering
15. 15.He ______ live in the country than in the city.
a. prefers b. likes to c. had better d. would rather
16. 16.______ to see a film with us today?
a. Did you like b. Would you like c. Will you like d. Have you liked
17. 17.I’m sorry, but I had no alternative. I simply ______ what I did.
a. must do b. had to do c. ought to have done d. have to do
18. 18.“Time is running out,______?”
a. a. hadn’t we better got start b. hadn’t we better get start
b. b. hadn’t we better get started d. hadn’t we better not started
19. 19.No one ______ that to his face.
a. dares say b. dares saying c. dare say d. dare to say
20. 20.The students in the classroom ______ not to make so much noise.
a. need b. ought c. must d. dare
21. 21.You ______ last week i