Be To Do Sth 的用法
先看一道高考题：
Did you tell Julia about the result?
Oh, no, I fogot. I _______ now.
A. will be calling
B. will call
C. call
D. am to call
这是一件打算做的事情，即一般将来时。选择B 还是D？关键要分清一般将来时中will 与be to do sth. 的区别。
口语中，be to do sth. 也可表示将来时，但它表示的是按计划要做的事。此题显然不是按计划要打电话的，因为他忘了。答案是B。
关于be to do sth. 的用法，在网上看到一篇资料，说得比较详细，这里整理后供大家参考。
1、表示按计划或安排要做的事。
When are you to leave for home?
你什么时候回家？
She is to be married next month.
她将于下个月结婚。
The Queen is to visit Japan in a week’s time.
女王将于一周后访问日本。
这种结构也可用于过去。was / were to do sth. 表示曾经计划要做的事，但并说明计划是否被执行了，所以也可表示曾经计划但未有实现的事。例如：
I felt nervous because I was soon to leave home for the first time.
我感到很紧张，因为我很快就要首次离开家了。
They said goodbye, little knowing that they were never to meet again.
他们告了别，不知道以后再也不会见面了。
We were to have told you, but you were not in.
我们本来想告诉你的，但是你不在家。
2、表示“想，打算”，相当于intend, want。
If we are to be there before ten, we’ll have to go now.
如果我们要在十点前到，我们现在就得走。
以下是be to do sth. 作情态助动词的用法。
3、表示“可以，可能”，相当于may, can。
The news is to be found in the evening paper.
这条消息可以在晚报上见到。
Such people are to be found everywhere.
这种人到处都有。
She is nowhere to be found.
在哪里也不着她。
4、表示“应该”，相当于should, ought to。
You are to report to the police.
你应该报警。
What is to be done?
应该怎么办呢？
5、表示“必须”，相当于must, have to。
The letter is to be handed to him in person.
这封信必须亲手交给他。
You are to do your homework before you watch TV.
看电视之前你得先做完作业。
6、用于否定句，表示“禁止”，相当于mustn’t。
The books in this room are not to be taken outside.
这个室内的书籍不得带出室外。
You are not to smoke in the reading-room.
你不可以在阅览室里吸烟。
7、用于第一人称疑问句，表示征求对方意见。
Am I to go on with the work?
要我继续完成这项工作吗？
What are we to do next?
我们下一步该怎么办？
8、在虚拟语气中，不论什么人称都用were to do sth. 表示对未来的假设。
If I were to tell you that I killed him, would you believe me?
要是我告诉你是我杀了他，你会相信吗？
Even if the sun were to rise in the west, I would never do such a thing.
即使太阳从西边出来，我也决不做这种事。
9、还有两个常用的be to do sth. 结构：be to blame(该受责备，对某坏事应负责任)，be to let(待出租)。两种结构中，用不定式的主动形式表示被动含义。
Which driver is to blame for the accident?
这事故是哪个司机的责任？
This house is to let.
这房子要出租。
Exercise
1. We have been looking for the boy all the afternoon but he is nowhere _____.
A. to see
B. seeing
C. seen
D. to be seen
2. As early as his second film, Chaplin had developed his own manner of acting, the one that ___ world famous.
A. would become
B. became
C. was to become
D. had become
3. ----We just saw John at the bookstore.
----That’s strange; I didn’t think he ____ back until tomorrow.
A. will come
B. was to come
C. is coming
D. is to come
4. The final examination ___early July.
A. is to be held
B. is to be taken place
C. is going to hold
be about to
D. will be to take place
5. If the sun ___ tomorrow, what would we do?
A. were not to raise
B. does not rise
C. would not rise
D. were not to rise
6. A new hospital w as to ____ in this district, but the money wasn’t collected yet.
A. have been built
B. be built
C. built
D. have built
7. Look at these clouds. ____.
A. It’s going to rain
B. It’s raining
C. It is to rain
D. It can rain
8. Who do you think ____ for the failure of their marriage.
A. to blame
B. to be blame
C. is to blame
D. is to be blamed
9. Neither you nor he ____ to the front.
A. are to be sent
B. is to be sent
C. have to be sent
D. is to send
10. I ____ to bed when there was a knock at the door.
A. went
B. am going to
C. was to go
D. was about to go
11.----____ we ____ again next week?
----Yes, let’s make it next Wednesday.
A. Are; to meet
B. Shall; be to meet
C. Will; meet
D. Are; meeting
12. As students, we ____.
A. won’t smoke
B. are not to smoke
C. aren’t smoking
D. don’t smoke
Key: 1.D 2.C 3.B 4.A 5.D 6.A 7.A 8.C 9.B 10.D 11.A 12.B

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。