高考英语语法:高中英语语法-“be to do”的用法
《高中英语语法-“be to do”的用法》由出国留学编辑精心为您学习英语准备。本内容整理时间为05月12日，如有任何问题请联系我们。
“be to do”的用法
一般说来，“be to do” 这个结构有两种语法意义，其一是连系动词be+动词不定式做表语，其二是be to是一个独立词汇单位，具有情态含义，可以把它叫做情态习语（modal idiom）。
一、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.
二、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：
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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.
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。
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。
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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.
5. 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.
6. 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。
Exercises：
1.This film _____ this Sunday.
A. is going to show B. is showing C. is to be show D. will have been show
2.The students were told that they ____ at the school gate at 2：00 the following afternoon.
A. met B. will meet C. were to meet D. were met
3. The house ______ ready today but as there has been a builders’ strike it is still only half finished.
A. is B. was to be C. was D. was to have been
4.In such dry weather，the flowers will have to be watered if they _________.
A. have survived B. are to survive C. would survive D. will survive
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5.How _______ I ______ what has become of him？
A. am； to know B. am； knowing C. was； to know D. will； know
6. ______ he ________ tomorrow，I would go to meet him at the station.
A. Were； to come B. Was； coming C. Did； come D. Would； come
中学英语教学资源网
《高中英语语法-“be to do”的用法》由出国留学编辑精心为您学习英语准备我们猜您可能喜欢以下文章： 雅思写作万能模板：如何增强表现力雅思写作技巧总结70个必备经典句型雅思写作网站:70个必备句型俄语阅读材料:俄语常用固定词组一2012雅思写作题目总结2010年雅思考试写作72个必备高中英语语法:高中英语语法解析 "IT"句型英语演讲:英语演讲比赛:My teacher英语演讲稿:我的老师 My Teacher 英语演讲稿英语演讲:I Love the Beauty of Changjiang Gorge标准日本语在线学习：语法纠错讲解～文法チェック『18