初中英语动词知识点：Be动词定义及用法
不***
21-12-08
英语知识大全一、be 动词做系动词
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
Mary's new dresses are
Mother is in the kitchen
I have been there
They shall be here at 10:00
That can't be
You are not being very
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 / No, he isn'
Are Mary's new dresses colourful? Yes, they / No, they aren'
Was mother in the kitchen then? Yes, she / No, she wasn'
Were you at home the day before yesterday? Yes, I / No, I wasn'
Was she late this morning? Yes, she / No, she wasn'
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
Who was singing in the room? Zhang
Where are you from? I am from
What class were you in? We were in Class
How old is Tom? He is
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
Tom and his friends are not in the
You were not nine years old when I went to the
He was not often late for his class when he was a
I wasn't here
My parents weren't at home last
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
二、be 动词做助动词
助动词be 有两个基本用法，一是与谓语动词一起构成各种时态，二是构成被动语态。
“be + 现在分词组”成各种进行式时态。例如：
Tony's maid is washing his new
The children are playing in the
Samuel was eating when I came
We have been living here since
This time next day they will be sitting in the
三、注意事项
英语句子中，为了表达时态或被动语态的需要，常常会出现几个助动词连在一块儿使用。也就是说，助动词be会和其它助动词一起使用。这时候，整个句子的一般疑问句和否定句，就不一定是对be 进行变化了，而是以第一个助动词为主进行变化。即哪个助动词在先，就以它为主进行变化。例如：
[肯定句] All the wonderful birds can be found in our Bird (助动词有两个：can be )
[疑问句] Can all the wonderful birds be found in our Bird Park? (移第一个can)
[否定句] All the wonderful birds can not be found in our Bird (在第一个can 后加not)
[肯定句] I have been there (两个助动词：have， been )
[疑问句] Have you been there before?
[否定句] I have not been there
[肯定句] I shall be having my supper at six tomorrow (两个助动词：shall， be )
[疑问句] Will you be having my supper at six tomorrow evening?
[否定句] I shall not be having my supper at six tomorrow
四、助动词be，无词义，辅助主要动词一起在句中作谓语动词。用法如下：
be+doing：构成进行时态，有现在和过去两种进行时态。如：
The girls is reading and copying the new words
Young Tom was always asking questions and trying out new
be+going to do，表示“打算或将要做某事”，be有现在和过去两种形式。如：
We are going to plant trees in the
I didn’t know if she was going to come
be+to do，表示“按计划安排将要做某事”。如：
The new shop is not to be opened till next One night an angel came to
Mary and told her that she was to have this special
五、there be
there be句式为：there be+主语部分+状语部分，表示“某处存在某物”，be常用现在时，过去时和将来时等。如：
Oh, cool! And there are many things to There is even a deer park in
There are about 80 pyramids in
Will there be a football match in your school next week?
六、实义be
可以将be视为实义动词，因为它具有实际的词义，如“成为;做;发生;举行;逗留;到达”等。如：His daughter wants to be a doctor for animals in her birthday party
will be at half past six this has been in China for
morethan two years, but he has not yet been to
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