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.另外，be动词还有成为的意思。下面小编告诉你初一英语动词be的用法，大家一起来看看吧!
初一英语动词be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
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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句式用于被动式:
■有通常情况下，there be句式中的 be表示“存在”。如:
There are numerous islands off the coast. 海岸边有许多岛屿。
There was a bed and a big wardrobe. 有一张床和一个大衣橱。
There was a rainbow in the sky. 天上有一道彩虹。
If there is any problem, let me know. 如果有什么问题可以通知我。
There is only one person I could approach. 只有一个人我可以去找。
There are in China over fifty minorities besides the Han nationality. 在中国除了汉族还有五十多个少数民族。
There is a lack of communication between the young and the old. 年轻人和老人之间沟通不足。
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■但是，有时there be结构还可用被动式，这时be即变成了助动词，如:
There are now published thousands and millions of books every year. 现在每年出版上亿册书。
On the following day, there was held a splendid banquet. 第二天举行了盛大的宴会。
there be句式的主语可以特指吗:
there be结构中的主语一般皆指不确定的事物，不专指特定的某一或某些事物，但有时也有例外，请看下面一些例证:
Xu said there was no longer the variety of play in China as in his days. 徐说中国已不再有他那个时代的那种打法(指乒乓球)了。(指类型时可用定冠词the, 表特定)
Many young people are taking radio courses in English. There is the boy next door, for example. 许多年轻人在学广播英语课程。比如隔壁那个男孩就是。(用the表特定事例)
Then there’s Mrs. Green—she must be invited to the wedding. 还有格林太太——必须邀请她参加婚礼。(与then连用，表“还有”)
There was the political situation to be considered. 这种政治形势需要考虑。(用the表需要考虑的特定问题)
Do you think there’s any chance that you could get a job in Paris? 你看你是不是有机会在巴黎找个工作呢?
There’s the small question of money. Airplane fares. a place to live. Little things like that. 有关钱的小问题啦，飞机票啦，住的地方啦，诸如此类的小事。(这里更需用the表示已明显提出的question)
There is the psychological novel;but the example of George Meredith has shown that it has no chance of ever becoming popular. 有的心理小说值得注意，但乔治·梅雷迪斯的实例说明它没有为大众所欢迎的可能。(这里the表示值得注意的特定事物)
When, at last, she stopped there followed the strangest silence. 当她终于停下来时，立即出现了一种非常异样的寂静。(the用于形容词高级)
there be结构的主语可以是代词吗:
there be结构中的主语可以是代词，如:
There’s but we two. 只有我们两个人。
Let’s see, there’s you and me…让我想一想，有你和我……
I’m old and he is my son. There is only he to take my body to the grave. 我老了，他是我的儿子。只有他给我送葬了。