be动词意思和用法很多,一般的意思是:是
此种用法,有多种变化形式：is,am,are,was,were,being,been,to be.
那么，它们的具体用法是什么呢?下面是英语be动词用法总结，大家一起来欣赏吧!
第一，be动词都有：am/is/are/was/were。都表示“是”的意思，在句子中充当谓语动词的成分。
第二，在一般现在时中，当主语是第一人称的时候，谓语动词可以用am。比如：
I am a boy.我是一个男生。
第三，在一般现在时中，当主语是第三人称he/she/it，又或者是名词单数的时候，后面的谓语动词可以是is。比如：
He is a student.他是一个学生。
The apple is red.这个苹果是红色的。
第四，在一般现在时中，当主语是they/we，又或者是名词复数时，后面的谓语动词可以是are。比如：
We are good friends.我们是好朋友。
The trees are tall.这些树是高的。
第五，在一般过去时中，当主语是it/he/she/I/名词单数时，谓语动词可以用was，不然就用were。比如：
It was red dog.它是一只红色的狗。
They were very happy.他们很高兴。
英语中的there be结构主要表示某处存在有某物，所以通常被称为存在句。其中的there为引导词，无词义，be为谓语动词，there be后面的名词为句子主语。
在there be句型中，若句子只有一个主语，谓语的数则取决于该主语的数;若有几个主语并列，则通常是与靠近的主语保持一致。如：
There is no cause for anxiety. 不必焦虑。
There is some dirt on your coat. 你的外套上有灰尘。
There are twenty children present. 在座的有20个孩子。
There is a teacher and some students over there. 那边有一位老师和一些学生。
there be结构的时态由其中的谓语动词be来体现，它可以有一般现在时、一般将来时、一般过去时、现在完成时以及过去完成时等多种时态形式。如：
There will be a rise in unemployment next year. 明年失业人数将会增加。
There have been a series of car accidents at the crossing. 在这个交叉路口已发生了一连串的车祸。
There had been two sea fights between them. 他们之间发生了两场海战。
there be结构有时可以与情态动词连用。如：
There may be an opportunity for you to see the premier. 你可能有机会见到总理。
There must be something wrong with my left arm, which is asleep.我的左臂发麻，一定出什么问题了。
There used to be a lot of troubles in that region. 那个地区过去动乱不断。
there be结构的非谓语形式有两种基本结构，即there being和there to be。一般说来，there being结构主要用作状语或介词宾语;There to be 结构主要用作动词宾语。如：
There being no further business, I declared the meeting closed. 没有更进一步的情况(讨论)，我就宣布闭会。
There is now some hope of there being a settlement of the dispute. 现在有点希望可以解决这次争端。
We expect there to be more discussion about this. 我们期望能对此展开更多的讨论。
注：用作介词宾语一般用there being，但用作介词for的宾语时，只能用there to be。比较：
They planned on there being another meeting. 他们打算再开一次会议。
They planned for there to be another meeting. 他们打算再开一次会议。
▲ 英语中的 There，除了表示地点“在那里”外，还有一个非常重要的用法，就是：充当引导词的角色，同时，引起句子结构上的倒装。具体表现在：
谈到倒装句，人们都不陌生，认为它是一个很重要的句式。其实，在一个人刚刚开始学英语的时候，就已经学到了真正意义上的倒装句：There be 句型。
There is a book on the desk. 去掉引导词 There，原来的倒装句则变成：A book is on the desk.
What is there on the desk? 实际等于说：What is on the desk?
There be是倒装句，表存在，不必细说。
There lived an man in the forest long ago. 很久以前，森林中住着一位老人。
There stands a temple on the top of the mountain. 山顶上有一座庙。
There goes the bell. Let’s have our class. 铃声响了，我们上课吧。
最后一句 There goes the bell. There 除了引起句子结构的倒装外，还提醒听者注意。
There are now published millions of books very year in China .
等于：Millions of books are now published very year in China.
On the following day, there was held a splendid banquet.
等于：On the following day, a splendid banquet was held.
There was shown at the exhibition an electronic computer made in Shanghai .
等于：An electronic computer made in Shanghai was shown at the exhibition.
There were running in the garden a group of children aged from seven to twelve.
等于：A group of children aged from seven to twelve were running in the garden.
【我的观点】任何事物的出现都是有原因的，语言现象亦然。我认为，there 的上述用法，体现了语言的3个方面。概括起来，不外乎以下几个原因：
1. 语用方面：There 置于句首，具有提示、提醒作用。如：There goes the bell. Let’s have our class.
2. 修辞方面：There 置于句首，旨在使句子匀称。如：There was shown at the exhibition an electronic computer made in Shanghai.
若说：An electronic computer made in Shanghai was shown at the exhibition. 会显得头重脚轻。
3. 语法方面：There 置于句首，改变句子的正常结构。去掉引导词 There 之后，变成正常语序，以上三种情况的例句，分别为：
(1) There is a book on the desk. → A book is on the desk.
(2) There lived an old man in the forest long ago. → An old man lived in the forest long ago.
(3) There are now published millions of books very year in China . → Millions of books are now published very year in China.
【说明】There置于句首，如果没有实际词汇意义，往往引起句子结构的倒装。如果有实际词汇意义(“在那里”)，则不然。试比较：
There stands a temple on the top of the mountain.
There I saw my old friend Tom. (There表示“在那里”)
■There is no / some / much / little difficulty / trouble with sth. 做某事 有困难。如：
(1) There is some difficulty with the text. 这篇课文还有点困难。
(2) There is little trouble with the matter. 这件事情没有什么麻烦。
■There is no / some / little / much difficulty / trouble in + doing. 做某事有困难。如：
(1) There is much difficulty in finishing the work in the given time. 在规定的时间内完成这项工作还很困难。
(2) There is no trouble in reading the article without a dictionary. 即使不用词典读这篇文章也不难。
■There is no doubt about / of sth. 毫无疑问…。如：
(1) There is no doubt about his coming here. 毫无疑问，他会来。
(2) There is no doubt of his words. 对他的话毋庸置疑。
■There is no doubt that –clause. 毫无疑问…。如：
(1) There is no doubt that he has made great progress this year. 毫无疑问，他今年进了大步。
(2) There is no doubt that he likes hunting. 毫无疑问，他喜欢狩猎。
■There is no hurry 不用急于干某事。如：
(1) There is no hurry to leave, for it is early. 天还早，不要急于离开。
(2) There is no hurry to answer this question, but use your head. 动动脑筋，不要急于回答这个问题。
■There is no need for sth. 没有必要怎么样。如：
(1) There is no need for him to go there. 她没有必要去那儿。
(2) There is no need for such a meeting. 没有必要开这样的会议。
■There is no question about sth. 毫无疑问…。如：
(1) There is no question about his arrangement. 对他的安排毋庸置疑。
(2) There is no question about what he said. 对他的话毋庸置疑。
■There is no question of doing sth. 毫无疑问…。如：
(1) There is no question of his leaving for holiday. 他肯定去度假了。
(2) There is no question of his inviting us to his party. 他肯定会邀请我们去参加他的聚会。
■There is no sense in doing sth. 做某事没有道理或说不过去。如：
(1) There is no sense in forcing him to do what he doesn’t like to. 强迫他做他不喜欢做的事情没有道理。
(2) There is no sense in leaving him alone when he is in trouble. 当他遇到困难时，扔下他不管，没有道理。
■There is no point in doing sth. 做某事没有用。如：
(1) There is no point in regretting. 后悔没有用。
(2) There is no point in reasoning with him. 跟他说道理没有用。
■There is no doing sth. 不可能…;无法…。如：
(1) There is no telling who will win the match. 无法断定比赛谁赢。
(2) There is no giving you a reply before deciding it. 在决定前不可能给你答复。
