be to do 的八种用法
用be to do造句
用be to do造句（原创版）目录1.了解"be to do"的含义和用法2.构造"be to do"的例句3.总结"be to do"的注意事项正文"be to do"是一个英语语法结构，用来表示计划、安排或注定要发生的事情。
它的基本形式是"be + to do"，其中"be"可以是 am、is、are 等动词，"to do"则表示要完成的动作或任务。
例如，我们可以用"be to do"来表达以下意思：- 我明天要去看电影。
（I am to go to the movies tomorrow.）- 他下周要参加会议。
（He is to attend a meeting next week.）- 她很快就要回来。
（She is to come back soon.）在使用"be to do"时，需要注意的是，它只能表示计划、安排或注定的事情，不能表示意愿或可能性。
例如，我们不能说"I am to go to the park"来表示我想去公园，只能说"I want to go to the park"或者"I am going to the park"。
此外，"be to do"还可以表示必须完成的任务，相当于"have to"或"must"。
例如，我们可以说"I am to finish this report by the end of the day"来表示我今天必须完成这份报告。
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be to do的用法和含义
be to do的用法和含义一级标题：介绍be to do的含义和基本用法be to do的用法和含义在英语中是非常常见且重要的。
它表达了按计划或安排应该发生的事情，也可用来传递命令、建议或责任等。
在这篇文章中，我们将深入探讨be to do这个短语的用法和含义。
二级标题1：表达计划或安排在英语中，be to do经常被用来描述按计划或安排应该发生的事情。
例如，“Iam to meet my friend at the café tomorrow afternoon.”（我明天下午要在咖啡馆见我的朋友）这句话表示根据计划，作者将会明天下午在咖啡馆与他的朋友见面。
be to do也可以通过现在进行时形式表示即将发生的事件。
例如，“She is getting married next month.”（她下个月将结婚）这句话意味着她已经有了一个确切的计划，在下个月要结婚。
不仅可以使用be动词+to do这种形式来表达某人自己应该做什么，还可以表示其他人期望他们完成某些任务。
例如，“The students are to hand in their a ssignments by Friday.”（学生们必须在周五前交作业）这句话表示老师期望学生按时提交作业。
二级标题2：表达命令、建议或责任除了表达计划之外，be to do还可以用来传递命令、建议或责任等的含义。
例如，“You are to finish your homework before you go out.”（你必须在外出前完成作业）这句话中的be动词表示家长对孩子的要求，他们必须先完成作业才能出门。
be动词+to do还可以用来隐晦地传递命令或指示。
例如，“The manager is not here, but if the boss calls, you are to tell him that the meeting has been postponed.”（经理不在，但如果老板打电话过来，你要告诉他会议已经延期了）在这个例子中，使用be动词+to do的形式向员工传达明确的指示。
be to do 用法详解 qq
be +动词不定式（即be + to do sth.）的用法如下：1.表示按计划或安排要做的事.例如：\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,但不表明计划是否被执行,或表示“命运（即命中注定要发生的事）”,而非计划；was / were to have done sth.表示未曾实现的计划.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“应该”,相当于should,ought to.例如：You are to report to the police.你应该报警.3.表示“必须”,相当于must,have to.例如：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.4.表示“想,打算”,相当于intend,want.例如：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.5.用于第一人称疑问句,表示征求对方意见.例如：6.用于否定句,表示“禁止”,相当于mustn’t.例如：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.表示“可以,可能”,相当于may,can.例如：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.在哪里也找不着她.8.were to do sth.用于if或even if / even though从句中,表示对未来的假设.例如：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.be to blame(该受责备,对某坏事应负责任)与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.例如：This house is to let.这房子要出租.对将要发生的事,如果人的意志不能控制,人为不能安排,则不可以用”be to do”,而要用will ,be going to do.如：It will rain.It is going to rain.不可用It is to rain.Will表示未经事先考虑而只是说话时临时作出的决定,表示说话人认为,相信,希望或假定要发生的事,也可表示倾向性或规律性,事物的固有属性或必然趋势.Be going to 表示事先经过考虑,或有迹象表明某事即将发生或肯定发生,一般带有时间状语,常用于口语.。
be to do的用法
“be to do”的用法一般说来,“be to do”这个结构有两种语法意义,其一就是连系动词be+动词不定式做表语,其二就是be to就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,表示主语与表语在概念上就是等同的。
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: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瞧已经实现了。
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。
Betodo的用法
Be to do的用法的用法①Be to 结构在英语中常表示将要发生的动作，相当于结构在英语中常表示将要发生的动作，相当于will。
The prime minister is to visit germany in may. ②Be to结构也可以表示安排好的事情或表示要求做的事情。
No one is to leave this building without their permission. ③表示将要发生的事情，常见的方式如下；1，will 表示将要发生的事情，各人称后都可以使用。
If we can’t find the taxi ,we will miss the plane. 2，shall主要用于第一人称后，构成疑问句，询问对方的意见。
What time shall I come. 3，be going to结构①表示打算干某事②表示某事即将发生。
He is going to buy her some flowers. m not going to argue with you tonight. I’I’m not going to argue with you tonight. 表示就要发生的事情4，be about to表示就要发生的事情turn of the gas -the soup is about to boil over. 非限定性定语从句的引导词的选择一，关系代词的选择①非限定性定语从句的关系代词不能用that引导。
指人时，如果引导词作主语用who，作宾语用whom，指物时用which。
注意，即使引导词作宾语也不可以省略。
②As和which的选择。
As和which都可以用来引导非限定性定语从句，用来指整个主句的内容，非限定性定语从句位于句末，且as或which在从句中作主语，宾语，表语时，两者可以互换。
③As和which引导的非限定性定语从句的区别1，如非限定性定语从句位于主句之前或插在主句之中时，只能用as。
be to do的用法
“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：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。
betodo的用法
“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：Their daughter is to get married soon.Who is to question himIt 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。
be to do的用法
“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：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。
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be to do的八种用法
一、表示坚决的命令，可译为“必须”。
1. This naughty boy is to stay here until the class is over. 这个淘气的男孩必须在这里站到下课。
2. No one is to enter this building without the permission of the security guard. 未经保安人员的允许，任何人都不得进入这栋楼。
二、表示“计划”或“安排的事项”。
3. Betty is to be married soon.贝蒂很快就要结婚了。
4. An insurance agent is to meet us this afternoon. 今天下午会有一个保险代理人来跟我们见面。
三、表示“可能性”。
5. Are you to pay the debt for your wife? 你会不会帮你的妻子还债？
6. The lovely puppy is nowhere to be found. 哪儿也找不到这只可爱的小狗。
四、表示“意图”“决心”或“打算”。
7. If you are to be there on time, you had better hurry.要想准时到达那儿，你最好快点。
8. If all of us are to remain friendly, we must be sincere with one another. 要想保持友谊，我们都必须真诚相待。
五、表示“应该”。
9. You have done so well. You are to be rewarded.你做得很好，你应该受到奖赏。
10. Such nasty questions are to be avoided. 应该避免这种下流的问题。
11. You are to call the police. 你应该报警。
六、表示“注定”“不可避免”“必然会发生”。
12. Anne was wondering what was to become of her boy friend, Tommy. 安妮不知道她的男朋友托米会出什么事。
13. The murderer was sentenced to life imprisonment and was never to see his family again. 杀人犯被判终身监禁并且永远不能和家人见面。
14. She did not think too much of her unkind acts. However, they were to be harmful to herself, too.她对她不友好的行为并没有想太多，然而，这些行为必将给她带来不利。
15. Tom wasn't worried about his head injury, but it was to be troublesome for him later. 汤姆并不担心他头部的损伤，但是以后这损伤必将给他带来麻烦。
16.You are to answer for what you have done. 你必将为你所做的事承担后果。
七、用于虚拟语气，表示一种假设。
17. If I were to do it, I would do it well. 这件事如果我来做，我会做好它。
18. Even if you were to take a taxi now, you would not be able to arrive at your destination on time.你现在即使坐出租车，你也不会准时到达目的地的。
八、有“期待将来”的含意。
19. The actual usefulness of the newly invented equipment is still to be determined.这种新发明出来的设备的实用性如何还有待观察。
20. Henry's appointment with the accountancy firm is yet to be confirmed.亨利与这家会计事务所的约定还有待确认。
Exercises:
1.This film _____ this Sunday.
A. is going to show
B. is showing
C. is to be shown
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
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
Keys: CCDBAA。