2017年高考英语语法必考知识点：be to do

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▲高考英语语法必考知识点：be to do

be to do:

1) 表示事先商定、安排或准备要做的事情。如：The students are to meet at the school gate tomorrow. 明天学生们将在学校大门口集会。

2) 表示可能性，必要、责任、义务、禁止等。如：Her necklace was not to(couldn't)be found. 她的项链找不到了。

▲高考英语语法必考知识点：be to do

be +动词不定式, 不定式做表语,表示主语和表语在概念上是等同的。

如：

The problem is to find a solution.

His plan is to clean the room.

My wish is to be a doctor.

▲高考英语语法必考知识点：be to do

be to +动词不定式中的be to用作情态习语, 这时的be to do表示: “计划”、“安排”、“义务”、“应该”、“可能”、“命运”等。(have to, ought to)。

如:

He is to have a holiday. (表示将来)

The committee is to meet today. (表示计划、安排)

You are to go to the hotel where rooms have already been booked for you.

1. 表示 “将”、“计划”、“安排”。(意思接近于be going to)

如：

Their daughter is to get married soon.

Who is to question him

It was the last film at the cinema，which was to close next day.

After dinner they were to go to a movie.

was/ were to do 表示过去曾经计划要做的事，或者过去应当做的事，而且从现在的角度来看已经实现了。

如：

I felt nervous because I was soon to leave home for the first time.

I was to play Juliet.

The expedition was to start in a week’s time.

was/ were to have done, 表示 “本打算”、“本计划”或“本应当” 做的事而没有做成或没有发生。

如:

I was to have seen him last Wednesday, but he didn’t come.

We were to have been married last year.

▲高考英语语法必考知识点：be to do

2. 表示 “义务”、“应该” 。(意思接近于should，must，ought to，have to)

如：

No one is to leave the building. 谁也不得离开这楼房。

You are not to smoke in this room.=You are not supposed to smoke in this room.

You are to be back by 10 o’clock. 你必须十点以前回来。

▲高考英语语法必考知识点：be to do

3. 表示可能性, 相当于can, may

如:

Such books are to be found in the library. 这样的书在图书馆里就能找到。

Not a single sound was to be heard. 一点儿声音也听不到。

Not a soul was to be seen. 看不到一个人影。

She was nowhere to be found. 哪儿也找不到她。

She was never to see his wife and family again.

▲高考英语语法必考知识点：be to do

4. 表示 “命运”, 将来必然要发生的事, 译作 “注定……”。

如：

He came to power, but he was to play dearly for it: soon he was assassinated.

The worst is still to come.

They said goodbye, little knowing they were never to meet again.

▲高考英语语法必考知识点：be to do

5. 用于“if…were to do”，表示虚拟语气。

如：

If it were to rain tomorrow, the sports meeting would be put off. 如果明天下雨, 运动会就会延期。

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