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.下面小编告诉你初一英语上be动词的用法，大家一起来看看吧!
初一英语上be动词的用法：
1、系动词+表语”的结构
当be 动词做系动词使用时，主要构成“系动词+表语”的结构，在句子中做谓语。表语可以是名词、形容词、副词、介词短语等。例如：
The man is a science teacher.
Mary's new dresses are colourful.
Mother is in the kitchen now.
I have been there before.
They shall be here at 10:00 tommorow.
That can't be true.
You are not being very polite.
Your brother is being very annoying this evening
2、be 动词的一般疑问句，方法是把be 移到主语前面，也可说成是移到句首。
Is the man a science teacher? Yes, he is. / No, he isn't.
Are Mary's new dresses colourful? Yes, they are. / No, they aren't.
Was mother in the kitchen then? Yes, she was. / No, she wasn't.
Were you at home the day before yesterday? Yes, I was. / No, I wasn't.
Was she late this morning? Yes, she was. / No, she wasn't.
3、be 动词用在特殊疑问句
在特殊疑问句里，be 动词仍然移到主语前面，但特殊疑问句是以特殊疑问词开头的，所以be 动词只能说是移到主语前面，或者说是在特殊疑问词的后面。例如：
Whose bike is broken? Xiao Ming's bike is.
Who was singing in the room? Mr. Zhang was.
Where are you from? I am from Wuhu.
What class were you in? We were in Class 2.
How old is Tom? He is ten.
4、be 动词的否定句
be 动词做谓语时，它的否定形式是在be 后加not，并且可以缩写。例如：
It is not sunny today.
Tom and his friends are not in the park.
You were not nine years old when I went to the university.
He was not often late for his class when he was a student.
I wasn't here yesterday.
My parents weren't at home last Sunday.
5、be 动词的祈使句
be 动词的祈使句有肯定和否定两种形式。肯定形式是以be 动词开头，而否定形式或强调句形，要加don't 或do。例如：
Be careful!
Be a good boy!
Don't be silly!
Don't be a fool!
Do be obedient!
Do be careful.
there be 句式的语法要点：
一、概说
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。
二、there be结构的主谓一致问题
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。
三、there be结构的时态问题
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。
四、there be结构与情态动词连用
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。
五、there be结构的非谓语形式
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。
含there be结构的几类重要句式：
一、There is no / some / much / little difficulty / trouble with sth. 做某事(没) 有困难
(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。
二、There is no / some / little / much difficulty / trouble in + doing. 做某事有困难
(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。
三、There is no doubt about / of sth. 毫无疑问……
(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。
四、There is no doubt that –clause. 毫无疑问……
(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。
五、There is no hurry (+ to do sth) 不用急于干某事
(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。
六、There is no need for (sb. to do ) sth. 没有必要怎么样
(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。
七、There is no question about sth. 毫无疑问……
(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。
八、There is no question of doing sth. 毫无疑问……
(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。
九、There is no sense in doing sth. 做某事没有道理或说不过去
(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。
十、There is no point in doing sth. 做某事没有用
(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。
十一、There is no doing sth. 不可能……;无法……
(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。
there be结构的be的活用：
■there be 结构中的be必须随着be后面名词的数及句子后面的时间，使用不同的形式或时态。如：
(1) There are fifty chairs, desks and a blackboard in our classroom. 我们的教室里有五十把椅子、五十张课桌和一块黑板。
(比较) There is a blackboard, fifty chairs and desks in our classroom. 我们教室里有一块黑板、五十把椅子和五十张课桌。
(2) There weren’t any high buildings in the village twenty years ago. 二十年前，村子里没有高楼大厦。
■there be结构可与情态动词can, could, will, would, must, may, might, ought to 及某些不及物动词seem, appear, happen等连用，如：
(1) Do go into the hole, for there can be snakes in it. 不要进到洞里面去，因为洞里可能有蛇。
(2) The car doesn’t run. There must be something wrong with it. 车不走了，肯定出了毛病。
(3) There seemed to be some people in the room, for the water is still hot. 房间里原来似乎有人，因为水还是热的。
(4) There happened to be a policeman there. 碰巧那儿有个警察。
■有时为了使句子表达生动，动词be 可换成 come, live, remain, stand, lie, appear, exist, seem, remain, …. 。如：
(1) Long ago, there lived a king who loved horses very much. 很久以前，有个非常喜欢马的国王。
(2) There stands a house on the top of the mountain. 山顶上有座房子。
(3) There exists some doubt in what he said. 在他所的话中有些疑点。
■there be 结构不能跟 have(有) 连用，但可跟 have / has + 过去分词，或 have /has to + be / stand / lie 等动词原形等连用。如：
(1) The man liked to plant trees, and soon there have been tall trees around his house. 那个人喜欢种树，不久他房子的周围就有了很多大树。
(2) There has to be air and water on the planet for living things to live on. 在那颗行星上必须要有能使生物生存的空气和水。
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