betodosth的几种用法
betodosth的意思是什么betodo的用法有哪些
be to do sth的意思是什么 be to do 的用法有哪些
be to do sth.
(1)表示安排，意向或目的
The U. S. President is to visit China.美国总统将访问中国
(2)(表义务）应该做……，必须做……
You are to be back by six o'clock.你要在6点之前回来
(3)(表可能）会做……
How am I to know what has become of him?我怎么知道他的遭遇如何？
(4)注定（通常用过去时）
He came to power，but was to pay dearly for it，soon he was killed.
他得到了权力，但是为此付出了昂贵的代价，不久他就被暗杀了
(5)（用于If...were to do句型）如果……的话
If you were to succeed，be sure to make full use of your time. 你如果想成功，就得充分利用时间
表将来的特殊形式：
be going to do表示打算去做成可能发生某事
be to do表示计划好做某事
be about to do表示既将（正要）做某事，要友生的动作，其后不接具体的时间状语
go , come , leave,arrive等少数转移性不及物动词的现在进行时表示按计划、妥排即将发生的动作，并不那么“固定”
leave, open等词的一般现在时可表示“按照时刻表或日程安排发生某事”。
be to do的用法
be to do的用法be to do是一个常用的英语短语，用于表示某个动作或事件将要发生或计划中的状态。
它通常被用于表达将来的安排、计划或期望。
下面将介绍be to do的常见用法及例句。
1. 表示将来的安排或计划be to do通常用来表示经过计划或安排将要发生的事件。
这种用法强调事情已被决定或约定，具有一定的正式性。
例如：(1) The meeting is to be held next week.下周将举行会议。
(2) The president is to visit France next month.下个月总统将访问法国。
(3) The exam is to be held at 9:00 a.m. tomorrow.明天上午9点将进行考试。
2. 表示合适或有义务的状态be to do还可以表示某个动作是合适的或有义务的状态。
这种用法通常用于陈述规定、规则或期望。
例如：(1) Students are to wear school uniforms.学生们应该穿校服。
(2) Passengers are to fasten their seat belts during the flight.乘客们在飞行中应系好安全带。
(3) Employees are to arrive at work on time.员工应该准时上班。
3. 表示很可能或预计的情况be to do还可以表示某件事情很可能或预计会发生，表示一种推测或猜测。
例如：(1) It is said that the new movie is to be released next month.据说新电影下个月将上映。
(2) The weather forecast says it is to rain tomorrow.天气预报说明天可能会下雨。
(3) The team is to play against their rival on Saturday.这个星期六，这支队伍将与他们的对手比赛。
be to do的含义和用法(一)
be to do的含义和用法(一)be to do的含义•“be to do” 通常用来表示将要发生的事情或计划中的安排•它可以用来表达将来发生的事件，或者约定、计划中的行动用法一：表示将要发生的事情•表示将来某个特定时间或日期会发生的事情–The meeting is to be held next Monday. (下周一将举行会议)•表示将来会发生的事件或行动–He is to receive an award for his achievements. (他将获得一项成就奖)用法二：表示计划或安排中的行动•表示即将要进行的行动或计划中的活动–They are to start the project tomorrow. (他们明天将开始这个项目)•表示指定的任务或职责–She is to manage the new department. (她将负责管理这个新部门)用法三：表示对现实状态的期望或命令•表示期望或命令某人按照某种状态或方式去做某事–You are to remain silent during the examination.(考试期间你要保持安静)•表示对将来的计划或要求–The students are to submit their assignments by Friday. (学生们要在周五之前提交作业)用法四：表示不确定事件或假设•表示假设、猜测或推测–If it rains tomorrow, the picnic is to be canceled.(如果明天下雨，野餐将被取消)•语气委婉地表示某事不太可能发生–He is not to be trusted. (他是不可信任的)以上是”be to do”的几种常见用法和含义，希望对你有所帮助。
be to do的五种常见用法
be to do的五种常见用法“同学们，今天咱们来学习一下 be to do 的五种常见用法。
”我站在讲台上对着学生们说道。
第一种用法呢，就是表示“按计划、安排即将做某事”。
比如说，“We are to meet at the school gate tomorrow.”这就表示我们明天按计划要在学校门口见面。
就像咱们学校安排了下周五全校师生去参观博物馆，那就可以说“All the teachers and students are to visit the museum next Friday.”第二种常见用法是表示“应该、必须做某事”。
例如，“You are to do your homework before you watch TV.”就是说你应该在看电视之前先做作业。
再比如，在咱们班级里，大家都要遵守纪律，那就可以说“All the students in our class are to follow the rules.”接下来是第三种用法，它可以表示“命运、注定要做某事”。
有个很经典的例子，“They were never to meet again.”意思就是他们注定再也不会见面了。
就像有些故事里，两个人因为各种原因分开了，仿佛命运就是这样安排的，他们就是 to be 分开的。
然后是第四种，它可以表示“想要、打算做某事”。
比如，“I am to buy a new book this weekend.”就是我打算这周末去买一本新书。
像咱们班的小明，他说他打算暑假去学游泳，那就可以说“Xiaoming is to learn to swim during the summer vacation.”最后一种常见用法是表示“有责任、有义务做某事”。
像医生就有责任救死扶伤，我们可以说“Doctors are to save lives and heal the wounded.”在社会中，每个人都有自己的责任和义务，我们都应该认真去履行。
be to do sth句型知识讲解
b e t o d o s t h句型be to do sth句型Be＋to do 不定式语言现象归纳必修5 Unit 4 课文原句：1、His discussion with his new boss，Hu Xin (HX)，was to strongly influence his life as a journalist.他与他的新上司胡欣的讨论对他的记者生涯将会产生重要的影响。
2、What do you imagine will be your future occupation? Suppose you were to be a journalist for China Daily, do you know what kinds of jobs they have?你认为你未来的职业是什么？假设你即将成为《中国日报》的记者，你知道他们要做哪些类型的工作吗？句式提取：be to do sth.“be to+动词原形”的常见用法：①表示“按计划、安排即将发生某事或打算做某事”。
②指该做或不该做的事情（语气上接近于should, must, ought to, have to），表示命令、吩咐或禁止的语气。
③指能或不能发生的事情（接近于can, may），表示可能性。
④表示不可避免将要发生的事情，后来注定要发生的事情。
⑤用于条件从句，意为“如果想……，设想”（接近if ...wantto/if ...should）。
We are to meet at the school gate. 我们将在学校门口见面。
You are to go to bed and keep quiet, kids. Our guests are arriving in less than 5 minutes.孩子们，你们必须上床睡觉，不准吵闹。
我们的客人五分钟之内就要到了。
How am I to know what has become of him?我怎么知道他的遭遇？His discussion with his new boss,Hu Xin, was to strongly influence his life as a reporter.他同新上司胡新的讨论对他的记者生涯必将产生很大的影响。
betodo的八种用法
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而。
三、表示“奇能性”。
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 huiry.要想准时到达那儿，你最好快点。
& 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”。
be to do的用法总结
be to do的用法总结一、be to do的用法总结be to do是英语中常见的短语形式，表达一种“预定”或“安排”的含义。
在语法上，be to do是由be动词（am/is/are/was/were）加上不定式to do构成的。
本文将对beto do的用法进行总结和探讨。
二、表示计划或安排1. 表示正式的安排或命令例如：We are to report to the manager tomorrow.我们明天必须向经理汇报。
The meeting is to be held in the conference room.会议将在会议室举行。
2. 表示未来的计划或预期例如：They are to marry next year.他们打算明年结婚。
The project is to be completed by the end of this month.这个项目预计本月底完成。
3. 表示规定例如：You are not allowed to smoke here; it is against the rule.在这里是不允许吸烟的，这是违背规定的。
4. 表示必然性例如：If you drop a glass, it is bound to break.如果你把杯子摔了，它肯定会破碎。
三、表示可能性1. 表示推测或假设例如：He looks very pale. He is likely to be sick.他看起来面色苍白，很可能生病了。
The train is expected to arrive in ten minutes.火车预计将在十分钟内到达。
2. 表示一种可能性或预示未来的事件例如：It is said that it's going to rain tomorrow.据说明天将会下雨。
She is to leave for Paris next week.她下周将前往巴黎。
betodo的正确用法
be to do的正确用法在英语里，“ be + to do ”结构可用来表示将来时间，下面是店铺整理的一些关于be to do的正确用法，欢迎大家阅读！be to do sth 的正确用法1、be + to do 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。
2、be + to do 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。
3、be + to do 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。
“ be to do ”的用法知多少
“ be+to do ”的用法知多少在英语里，“ be + to do ”结构可用来表示将来时间，它的具体用法如下：1. 表示“按计划、安排”。
例如：We are to meet at the school gate.They are to go travelling in August.2. 表示“命令”。
例如：You are to be back before five o’clock.The room is to be locked.3. 表示”职责”。
例如：I am to inform you that the meeting will be held in Wuhan.He is to design a new machine.4. 表示“目的”。
例如：The prize was to honour him for his great discoveries.5. 表示“用途”。
例如：A pen is to write with.6. 表示“命中注定”。
例如：They were never to meet again.7. 表示“应该做”。
例如：What are we to do next？What is to be done when something gets into your eyes？8. 表示“可能性”。
例如：It’s eleven o’clock now. He is to get to Mike’s house. Let’s see who is to win the game.9. 表示“征求对方的意见”。
例如：Am I to go on with the work？When are they to hand in their plan？。
be动词不定式（即betodosth.）的用法
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：When are you to leavefor home?你什么时候回家？She is to be marrie d next month.她将于下个月结婚。
The Queenis to visitJapaninaweek’stime.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 nervou s becaus e I was soon to leavehome for the firsttime.我感到很紧张，因为我很快就要首次离开家了。
They said goodby e, little knowin g that they were neverto 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sho uld, oughtto。
例如：You are to report to the police.你应该报警。
What is to be done?应该怎么办呢？3.表示“必须”，相当于mus t, 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 homewo rk before you watchTV.看电视之前你得先做完作业。
be to do的用法详解
be to do的用法详解一、be to do的用法解析1. be to do作"被期望、被要求"解1.1 表示按计划或安排要做某事"I am to attend a meeting tomorrow." (我明天要参加一个会议。
)1.2 表示按照规定或命令必须做某事"You are to submit your report before the deadline." (你必须在截止日期之前提交报告。
)1.3 表示别人期望或希望你做某事"She is to sing at the concert tonight." (她今晚要在音乐会上唱歌。
)2. be to do用于强调将来发生的动作或事件2.1 表示根据安排或计划，某事将在未来发生"The performance is to take place next week." (演出将在下周进行。
)2.2 强调确定性和义务"He is to complete the project by the end of this month." (他必须在本月底之前完成这个项目。
)3. be about to do表示即将发生的动作或事件"I was about to leave when he called me." (当他打电话给我时，我正准备离开。
)4. be going/gonna + 动词原形表示即将发生的动作或事件。
"They were going to start a new project." (他们打算开始一个新项目。
)二、be to do的用法示例1. 各类期望和要求1.1 The students are to complete the assignment by tomorrow.(学生们需要在明天之前完成作业。
be to do sth 的几种用法讲解学习
be + to do sth.的用法1.表示按计划或安排要做的事。
例如：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。
What is to be done?应该怎么办呢？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。
betodo的用法及句型
betodo的用法及句型1. “Be to do”可以表示计划或安排呀！比如说，“I'm to meet my friend this afternoon.（我下午要去见我的朋友。
）”你看，这多清晰地表达了我的一个安排呀！2. 它还能表示命令或指示呢！“You are to finish your homework before dinner.（你得在晚饭前完成你的作业。
）”这就像老师对你下的命令一样，是不是很形象呢？3. “Be to do”也可以表示责任或义务哟！“We are to take care of our parents when they get old.（我们有责任在父母年老时照顾他们。
）”难道我们不应该这样做吗？4. 有时还能表示注定会发生的事情呢，就像“His dream is to come true one day.（他的梦想注定有一天会实现。
）”哇，这多让人期待呀！5. 可以用来提出建议呀，“You'd better be to study harder.（你最好更加努力学习。
）”这真的是个好建议，不是吗？6. 它在一些正式的场合也很有用哦，“The meeting is to be held at 9 （会议将在上午 9 点举行。
）”多正式呀！7. 表示可能性也不在话下呢，“It's not to rain tomorrow.（明天不可能下雨。
）”你说呢？8. 在故事里也可以用呀，“The hero was to save the world.（这位英雄将要拯救世界。
）”多酷呀！9. 甚至可以用来表达决心呢，“I am to achieve my goal no matter what.（不管怎样我都要实现我的目标。
）”这就是我的决心！总之，“be to do”的用法真的很多很有趣呀，大家一定要好好掌握哦！。
betodo的用法详解
be to do 的用法详解be to do共有八种用法：表示坚决的命令、表示“计划”或“安排的事项”、表示“可能性”、表示“意图”、表示“应该”、表示“注定”“不可避免”“必然发生”、用于虚拟语气，表示一种假设、有“期待将来”的含义。
1.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。
2.表示“计划”或“安排的事项”。
(1)Betty is to be married soon.贝蒂很快就要结婚了。
(2)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。
3.表示“可能性”。
(1)Are you to pay the debt for your wife?你会不会帮你的妻子还债？(2)The lovely puppy is nowhere to be found.哪儿也找不到这只可爱的小狗。
4.表示“意图”“决心”或“打算”。
(1)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。
(2)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。
5.表示“应该”。
(1)You have done so well. You are to be rewarded.你做的很好，你应该受到奖赏。
be to do的用法
"be to do" 是一个常用的英语结构，表示计划、安排或预期要做的事情。
这个结构通常用于描述未来的行动或计划，强调事情已经安排好或即将发生。
下面是 "be to do" 用法的几个例子：
1. 计划或安排：
* We are to meet at the train station at 5 pm. 我们计划在下午5点在火车站见面。
* They are to get married next year. 他们计划明年结婚。
2. 表示义务或职责：
* You are to finish your homework before watching TV. 你应该先完成作业再看电视。
* He is to pay the bill by the end of the month. 他必须在月底前支付账单。
3. 表示可能性或预期：
* It is to rain this afternoon. 今天下午可能会下雨。
* He is not to be trusted. 他不可信。
需要注意的是，"be to do" 结构中的 "to" 是不定式符号，表示后面的动词是未发生的动作。
这个结构也可以与情态动词 "can" 或 "could" 一起使用，表示能力或可能性。
例如：
* She can't be to do it all by herself. 她不可能一个人完成所有的事情。
betodosth句型的用法总结
be to do sth句型的用法总结下面是店铺整理的一些关于be to do sth句型的用法，以供大家学习参考。
be to do sth句型的用法总结1、His discussion with his new boss，Hu Xin (HX)，was to strongly influence his life as a journalist .他与他的新上司胡欣的讨论对他的记者生涯将会产生重要的影响。
2、What do you imagine will be your future occupation? Suppose you were to be a journalist for China Daily, do you know what kinds of jobs they have?你认为你未来的职业是什么?假设你即将成为《中国日报》的记者，你知道他们要做哪些类型的工作吗?句式提取：be to do sth.“be to+动词原形”的常见用法：①表示“按计划、安排即将发生某事或打算做某事”。
②指该做或不该做的事情(语气上接近于should, must, ought to, have to)，表示命令、吩咐或禁止的语气。
③指能或不能发生的事情(接近于can, may)，表示可能性。
④表示不可避免将要发生的事情，后来注定要发生的事情。
⑤用于条件从句，意为“如果想……，设想”(接近if ...want to/if ...should)。
(1)be to do句型的含义：①表示注定要发生的事。
②预先安排好的计划或约定。
③表示说话人的意图、职责、义务、命令等情感意义。
(2)表示将来的主要句型：①will/shall do表示单纯的将来或主语的“意愿”。
②be going to do sth.表示将要做某事时，指主语“计划、打算”做的事，这时主语只能是人。
主语是事物时，表示说话人根据某种迹象主观推测可能发生的事。
be+动词不定式(即be+todosth.)
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：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 / we re 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.What is to be done应该怎么办呢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：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.to do sth.用于if或even if / even though从句中,表示对未来的假设.例如：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.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：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.Exercisehave been looking for the boy all the afternoon but he is nowhere _____.see be seenearly as his second film,Chaplin had developed his own manner of acting,th e one that ___ world famous.become to become becomejust saw John at the bookstore.----That’s strange; I didn’t think he ____ back until tomorrow.come to come coming to comefinal examination ___early July.to be held to be taken placegoing to hold be to take placethe sun ___ tomorrow,what would we donot to raise not risenot rise not to risenew hospital was to ____ in this district,but the money w asn’t collected ye t.been built built builtat these .’s going to rain ’s rainingis to rain can raindo you think ____ for the failure of their marriage.blame be blame to blame to be blamedyou nor he ____ to the front.to be sent to be sent to be sent to send____ to bed when there was a knock at the door.going to to go about to gowe ____ again next week----Yes,let’s make it next Wednesday.; to meet ; be to meet; meet ; meetingstudents,we ____.’t smoke not to smo ke’t smoking ’t smokeKey:作业帮用户2017-10-13。
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 sth.的用法
1.表示按计划或安排要做的事。
例如：
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。
What is to be done应该怎么办呢
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：
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
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。
to do sth.用于if或even if / even though从句中，表示对未来的假设。
例如：
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。
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：
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
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 was 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
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 ____.
B. are not to smoke A. won't smoke
C. aren't smoking
D. don't smoke
Key:。