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活动 5)He is to go to New York next week.

The president is to speak on TV tonight.

You are to explain this. We can't stand this kind of behavior.

Tip: be to表示未来的打算和安排，或用于正式的指示和命令。

补充：be + 动词不定式的其他用法

a.征求意见。如：

How am I to answer him?

我该怎样答复他？

b. 表示相约、商定。如：

We are to meet at the school gate at seven tomorrow morning.

我们明天早晨7点在校门口集合。

6)He is likely to win the first prize.

That is not likely to happen.

Tip: be likely的意思是某事有可能发生或可能是真的。

7)Teachers are supposed to treat all the students alike.

You are not supposed to smoke on the bus.

Tip: be supposed to用来表示"被期望"或"应该"。其否 定形式be not supposed to用来表示"不允许"。

补充：1）当be supposed to... 的主语是"物"时，它表 示"本应；本该"，用于表示"某事本应该发生而没有发生"。

The train was supposed to arrive an hour ago.

2）be supposed to后面接"have + 过去分词"时，表示"本应该做某事而没做"。

You are supposed to have handed in your home-

work by now.

8)I used to love cats until I was attacked by a big black cat last week.

He didn't use to smoke when he was young.

Did he use to come as often as he does now?

used to表示"过去一直"或"过去经常"。

Practice:

1. Jack's ill, so they ______ change their plans.

A. must B. should C. have got to D. ought to

2. If it is fine tomorrow, we ______ a football match.

A. have B. will have C. has D. shall has

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. 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. People are _____ to _____ when they meet for the first time.

A. suppose; shake hands B. supposed; shake hands

C. supposed; shake hands D. suppose; shake hand

6.When he was at school, he ______ early and take a walk before breakfast. A. should rise B.would rise