1.be与介词或副词连用，可以表示“位于，在(某处)”“(在某时或某地)发生”“留在(某地)；逗留”“出席；到场”等。
2.be用于完成时时，可接介词或副词表示“前往；造访”等。
3.be和from连用可表示“来自；是(某地的)人”。

let it be
不理会leave it alone
Don't touch that wasp.Let it be.别碰那黄蜂,让它飞走吧。
If the baby's sleeping, let her be.婴儿如果睡着了,就让她睡吧。

用作不及物动词
▲S+～(+A)
Smith's upstairs.史密斯在楼上。
The door is on the left.门在左首。
The hospital is four miles away.医院距此地三英里远。
Whatever is, is right.存在的，就是合理。
The prize-giving ceremony is on Monday.颁奖典礼在星期一举行。
The meetings are always in the main conference room.会议总是在主会议室举行。
Dinner is at eight.晚宴八点举行。
When is the wedding to be?婚礼何时举行？
When a thing has to be, it had better be quickly.如果一件事迟早要发生，那就快点发生好了。
To be or not to be, that is the question.生存还是毁灭，那就是问题所在。
We're here till Spring Festival.我们将在这里一直住到春节。
She has been in my room three hours.她在我的房间里呆了三个小时了。
They won't be a year.他们要离开一年。
President will be at the party.总统将出席聚会。
They'll be here soon.他们很快就会到达。
Has the policeman come yet?警察来过了吗？
She had been abroad many times.她曾多次出国。
I've never been to Canada.我从未去过加拿大。
He's from Japan.他是日本人。

be, exist, live
参见exist条。

1.be用作助动词时可与动词的现在分词连用,构成进行时态,也可与及物动词的过去分词连用,构成被动结构。
2.be可以和动词不定式连用，有以下几点意义：①表示计划或安排要发生的事或打算要做的事，不定式可用被动式，在was或were后用不定式的完成式可表示“本来打算…”；②表示“必须”“得”等，意思接近must, have to；③表示“应该”“宜于”等，意思接近should，有时用来征求对方的意见，不定式可用被动式；④表示“可以”“能”等，意思接近can, may，多用于被动结构；⑤表示“想要”等，意思接近want to, intend to；⑥表示注定要发生的情况，常用于过去式；⑦表示虚拟语气，用于与事实相反的条件句中。
3.be置于句首引起倒装句，可表示虚拟语气，这带点文学色彩，不太常用。

用作助动词
▲S+～+v-ing
They are/were dancing.他们正在跳舞。
I shall be seeing him tonight.今天晚上我就能见到他。
▲S+～+v-ed
He was caught.他被捉住了。
The job can be done in a moment.这件工作马上就能完成。
▲S+～+to-v
When are we to leave France for home?我们什么时候离开法国回国？
Are you to  go there by bike or by bus?你骑车去还是坐车去？
They are to send more people to help in the work.他们打算派更多的人去帮助进行这项工作。
They are to be married.他们打算结婚。
The products we were to design included different models of motors.我们准备设计的产品包括各种型号的电动机。
The machine is to be redesigned.这机器将重新设计。
Prices are to be fixed later.价钱以后再定。
I was to have seen him last Wednesday but he did not come.我本来是上星期三和他见面的，但他没有来。
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。
Visitors are to leave when the bell rings.来访者必须在铃响时离开。
The letter is to be handed to him in person.信必须亲手交给他。
You are to hand in the exercises tomorrow.你们明天(得)交练习。
You are not to touch that.你不要碰这个东西。
I told him he was not to make that mistake again.我告诉他不要再犯这个错误。
You are to come home at once.你得马上回家。
Under this treaty, they were to pay an indemnity for five million dollars.根据这项条约，他们应赔款500万美元。
In future you are not to do that again.以后你不能再这样做了。
What am I to do then?我该怎么办呢？
Are we to meet again tonight?我们今晚还要碰头吗？
Such questions are to be avoided.这种问题应当避免。
The books in this room are not to be taken outside.本室书籍不得携出室外。
But how are we to convince them?但是我们怎么能使他们相信呢？
It is not to be denied.这是不容否认的。
But they were to be discouraged by this difficulty.但这一困难并不能使他们泄气。
We Chinese people are not to be cowed or deceived.我们中国人是吓不倒也骗不了的。
Not a sound was to be heard.一点声音也听不见。
Such people are to be found everywhere.这种人到处都有。
Buildings of modern construction are to be seen everywhere.到处都可以看到现代化建筑。
I must continue to learn if I am to make further progress.如果要继续进步，我就得继续学习。
If we are to be there in time, we'll have to hurry up.如果我们要准时到，我们就得加快了。
Better days were soon to follow.不久之后日子就变得好过些了。
I first met him in 1978, I was not to meet him again for ten years.我第一次见到他是1978年，以后十年我们都没见过。
If I were to do that, what would you say?假如我做那件事的话,你会怎样说呢?
If it were to rain, we should get wet.要是下雨，我们就会淋湿。
▲Be+主语+实义动词+其他
No man loves his fetters, be they made of gold.即使是金子做的镣铐，也没人喜欢。

1.be作系动词可用于There is/are句型，意思是“有；存在”。
2.be还可与名词、代词、形容词、副词、介词短语、动词的现在分词及过去分词、动词不定式或名词性从句连用，以提供名称或信息。
3.be还可用于It is/was句型，用于描述情况或表达想法，也可用于表达时间等。
4.be还可与mine〔yours, etc.〕或for me〔you, etc.〕等连用，表示某物的所属。
5.be还可与表示数量等的名词连用，表示花费、值、等于、等同等义。
6.be还可与everything〔nothing, etc.〕 (to sb)连用，表示对某人的重要性。
7.be置于句首引起倒装句，可表示虚拟语气，这带点文学色彩，不太常用。

be oneself
自然行事 act naturally
You're far nicer when you're just being yourself.当你完全处于自然状态时,你显得好多了。

be that as it may
即使如此,尽管那样 yet; even so
I know you don't like him but be that as it may, you can at least be polite to him.我知道你不喜欢他,不过即使如此,你至少能对他有礼貌。

...that was...
如人们过去对…常用的称呼 as sb used to be called
Miss Brown that was before she married.布朗小姐,即她婚前的称呼。

用作系动词
▲There+～+S (+A)
Is there a God?上帝存在吗？
There's a bank down the road.沿马路不远有一家银行。
Once upon a time there was a child cowherd.从前有一个放牛郎。
Is there anything that is beyond the boundary of human knowledge?有什么东西是超出人类知识范围的吗?
There have been cows in that field since my great-grandfather's time.从我曾祖父那时候起,那片土地上就养着牛。
There is a bookstore around the corner.拐角处有一家书店。
There is nobody to direct the workers.没有人指挥工人们。
▲S+～+n./pron.
Susan is a nurse.苏珊是个护士。
I want to be a pilot when I grow up.我想长大后当飞行员。
She's a great beauty.她是个大美人
“Who is that”“It's my husband.”“那个人是谁？”“是我丈夫。”
You're the biggest mistake I've ever made.和你结婚是我一生中犯的最大错误。
Across the street was a textile mill.街对面有一家纱厂。
China is a socialist country.中国是一个社会主义国家。
Today is Sunday.今天是星期日。
Lack of money is our biggest problem.缺钱是我们的最大问题。
He is no fool.他可不傻。
This is no place for young folk.这可不是青年人该去的地方。
It's me.是我。
That's it.对啦！
How are things?情况如何？
▲S+～+adj./adv.
The world is round.地球是圆的。
The traffic on this road is very busy.这条马路的交通很拥挤。
Be quick!快点！
She was angry at his words.她对他的话很生气。
He was absent from class yesterday.他昨天缺课。
I'm certain about it.我对此事有把握。
She's already up and about.她已能下地走动了。
His new novel is not out yet.他的新小说尚未出版。
▲S+～+v-ing/v-ed/to-v
My sight's going.我的视力在逐渐减退。
Seeing is believing.眼见为实。
His only hobby is growing flowers.他唯一的爱好是种花。
We were very much frightened.我们都吓坏了。
This article is well written.这篇文章写得很好。
Her work is to look after the children.她的任务是照料孩子。
Their hope is for John to marry a bit later than usual.他们希望约翰比一般人晚些结婚。
His hesitation was whether to return or press ahead.他犹豫的是掉头回去呢，还是奋力前进。
▲S+～+that/wh-clause
The fact is that he is innocent.事实上他是无辜的。
My suggestion is that we should set up a working group.我的建议是我们应当成立一个工作组。
That's not what we want.那不是我们所要的东西。
The problem is how we could make him understand all this.问题是我们怎样使他懂得这一切。
▲S+～+mine〔yours, etc.〕/for me〔you, etc.〕
The money is not yours, it's John's.这钱不是你的，是约翰的。
The dictionary is for you.这本字典是给你的。
▲S+～+数量短语
“How much is that hat?”“Twenty dollars.”“那顶帽子多少钱？”“20美元。”
Two and three is five.2加3等于5。
▲S+～+everything〔nothing, etc.〕 (+ to sb)
Money isn't everything.金钱不是一切。
I used to love her but she's nothing to me any more.我爱过她，但现在对她再也没什么感情了。
▲It is/was+n./adj.
It was really hot in the sauna.桑拿浴的确很热。
It's going to be a great match.这将是一场了不起的比赛。
It's up to you to decide.这该由你来决定。
It's six thirty.现在是六点三十分。
▲Be+主语+表语+其他
Be the problem easy or difficult, this method applies.不管这问题容易还是困难，这个方法都是适用的。

be, become
参见become条。
be in, wear
参见wear条。