第三人称单数：is现在分词：being过去分词：been过去式：was; were
be基本解释
动词是; 有，存在; 做，成为; 发生
助动词用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质
be相关例句
动词
1. What were you doing from 9 to 11 this morning?
今天上午九点到十一点你在做什么？
2.
2. You're to do your homework before you watch TV.
你应该做了功课再看电视。
不及物动词
1. Tony is in the office.
汤尼在办公室里。
2. He'll be at his uncle's till next Friday.
他要在他舅舅家呆到下星期五。
3. be的意思
3. It was not to be.
不应有此事。
be情景对话
否定表达
A：My advice would be to finish it at once.
我的建议是立刻做完。
B：It’s unnecessary.
B：没必要。
租房
A：Don’t (worry/ be concerned) about the security deposit.
别担心押金。
B：O.K. Great.
好的，好。
购物
be在线翻译
B：Yes, it seems to be (working fine/ operating/ functioning properly).
是的，好像（有用了/可以运行了/可以正常使用了）。
A：Great.
太好了。
be网络解释
1. 比利时：[地址]比利时沙勒罗瓦 [申请人]阿尔斯托姆比利时股份有限公司 [公开号]1289475 [国家省市]比利时(BE) [国际分类]H02M7/00 [摘要] 本发明涉及由IGBT型静态开关组成的、用直流电源电压(Ucat)供电的功率转换器,
2. be：bound energy; 结合能
3. be：barrett ′ s esophagus; barrett食管
4. be：bases excess; 碱剩余
5. be：bacteria exudation; 喷菌现象
be词典解释
助动词用法（AUXILIARY VERB USES）
In spoken English, forms of be are often shortened, for example ‘I am’ is shortened to ‘I'm’ and ‘was not’ is shortened to ‘wasn't’.1. （和现在分词连用构成动词的进行式）
You use be with a present participle to form the continuous tenses of verbs.
e.g. This is happening in every school throughout the country...
全国各地每所学校都在发生这样的事情。
e.g. She didn't always think carefully about what she was doing...
她对自己在做的事情并不总是考虑得很清楚。
2. （和过去分词连用构成被动语态）
You use be with a past participle to form the passive voice.
e.g. Forensic experts were called in...
法医专家被请来。
e.g. Her husband was killed in a car crash...
她的丈夫死于车祸。
3. （和不定式连用表示将来的安排或确定会发生的事情）
You use be with an infinitive to indicate that something is planned to happen, that it will definitely happen, or that it must happen.
e.g. The talks are to begin tomorrow...
谈判将于明天开始。
e.g. It was to be Johnson's first meeting with the board in nearly a month...
这将是近一个月来约翰逊首次和董事会碰面。
4. （和不定式连用表示在某种情况下会发生什么事，应该怎样做或应该由谁来做）
You use be with an infinitive to say or ask what should happen or be done in a particular situation, how it should happen, or who should do it.
e.g. What am I to do without him?...
没有他，我该怎么办？
e.g. Who is to say which of them had more power?...
谁来决定他们之中谁的权力应该更大一些？
5. （was和were和不定式连用，表示说话时间之后发生的事）
You use was and were with an infinitive to talk about something that happened later than the time you are discussing, and was not planned or certain at that time.
be
e.g. Then he received a phone call that was to change his life...
然后，他接到一个将改变他一生的电话。
e.g. A few hours later he was to prove it.
几个小时之后他将证明这一点。
6. （表示可见到、可听到、可发现等）
You can say that something is to be seen, heard, or found in a particular place to mean that people can see it, hear it, or find it in that place.
e.g. Little traffic was to be seen on the streets...
街上车辆很少。
e.g. They are to be found all over the world.
它们遍布于世界各地。
其他动词用法（OTHER VERB USES）
In spoken English, forms of be are often shortened, for example ‘I am’ is shortened to ‘I'm’ and ‘was not’ is shortened to ‘wasn't’.1. （用于提供与主语相关的信息）
You use be to introduce more information about the subject, such as its identity, nature, qualities, or position.
be的翻译
e.g. She's my mother...
她是我母亲。
e.g. This is Elizabeth Blunt, BBC, West Africa...
英国广播公司的伊丽莎白·布伦特在西非为您报道。
2. （以it作主语，用来进行描述或作出判断）
You use be, with 'it' as the subject, in clauses where you are describing something or giving your judgment of a situation.
e.g. It was too chilly for swimming...
这时候游泳太冷了。
e.g. Sometimes it is necessary to say no...
有时候拒绝是必要的。
3. （与非人称代词there连用构成there is和there are表示存在或发生）
You use be with the impersonal pronoun 'there' in expressions like there is and there are to say that something exists or happens.
e.g. Clearly there is a problem here...
显然，这里出了个问题。
e.g. There are very few cars on this street...
这条街道上车辆很少。
4. （表示主语和从句和其他从句结构之间的某种联系）
You use be as a link between a subject and a clause and in certain other clause structures, as shown below.
e.g. It was me she didn't like, not what I represented...
她不喜欢的是我，而不是我的陈述。
e.g. What the media should not do is to exploit people's natural fears...
媒体不应该利用人们天生的恐惧心理。
5. （用在如the thing is和the point is这样的结构中，引导表示陈述或提出观点的从句）
You use be in expressions like the thing is and the point is to introduce a clause in which you make a statement or give your opinion.
e.g. The fact is, the players gave everything they had...
事实上，选手们尽了全力。
e.g. The plan is good; the problem is it doesn't go far enough.
计划不错；问题在于不够深入。
6. （用在如to be fair, to be honest或to be serious 这样的结构中表示尽量）
You use be in expressions like to be fair ,to be honest, or to be serious to introduce an additional statement or opinion, and to indicate that you are trying to be fair, honest, or serious.
e.g. She's always noticed. But then, to be honest, Ghislaine likes being noticed...
她总是受到关注。但是说句实在话，吉莱纳喜欢被人关注。
e.g. It enabled students to devote more time to their studies, or to be more accurate, more time to relaxation.
它可以让学生们有更多的时间来学习，或者更准确一点说，有更多的时间来放松自己。
7. （有时用来代替现在时态中be的几个常规形式，尤用于whether后）
The form 'be' is used occasionally instead of the normal forms of the present tense, especially after 'whether'.
e.g. The chemical agent, whether it be mustard gas or nerve gas, can be absorbed by the skin.
这类化学制剂，不管是芥子气还是神经瓦斯，都会被皮肤吸收。
8. 存在
If something is, it exists.
e.g. It hurt so badly he wished to cease to be.
他觉得疼痛难忍，恨不得死了算了。
e.g. ...to be or not to be.
活着还是死去
9. 保持真我；按自己的方式行事；显常态
To be yourself means to behave in the way that is right and natural for you and your personality.
be的意思
e.g. She'd learnt to be herself and to stand up for her convictions.
她已经学会了按自己的方式行事，坚持自己的信仰。
10. 非常；极为
If someone or something is, for example, as happy as can be or as quiet as could be, they are extremely happy or extremely quiet.
11. 如果不是…的话；如果没有…的话
If you talk about what would happen if it wasn't for someone or something, you mean that they are the only thing that is preventing it from happening.
e.g. I could happily move back into a flat if it wasn't for the fact that I'd miss my garden...
如果不是因为我会想念自己的花园的话，我会很乐意搬回公寓住。
e.g. If it hadn't been for her your father would be alive today.
如果不是因为她，你父亲今天可能还活着。
12. 尽管那样；即便如此
You say 'Be that as it may' when you want to move onto another subject or go further with the discussion, without deciding whether what has just been said is right or wrong.
be的近义词
e.g. 'Is he still just as fat?' — 'I wouldn't know,' continued her mother, ignoring the interruption, 'and be that as it may, he has made a fortune.'
“他还是那么胖吗？”——“我不知道，”她妈妈接着说，没有理睬这一打岔，“就算那样，他已经发财了。”
13. 身体不舒服；身体不适
If you say that you are not yourself, you mean you are not feeling well.
e.g. She is not herself. She came near to a breakdown.
她身体不舒服，简直要崩溃了。