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.

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。

1、“be + 现在分词组”成各种进行式时态。例如：

Tony's maid is washing his new car.

The children are playing in the field.

Samuel was eating when I came in.

We have been living here since 1959.

This time next day they will be sitting in the cinema.

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 Park. (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 Park. (在第一个can 后加not)

[肯定句] I have been there before. (两个助动词：have, been )

[疑问句] Have you been there before?

[否定句] I have not been there before.

[肯定句] I shall be having my supper at six tomorrow evening. (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 evening.

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：

1. 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 now.

Young Tom was always asking questions and trying out new ideas.

2. 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 park.

I didn’t know if she was going to come here.

3. 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 Monday. One night an angel came to

Mary and told her that she was to have this special boy.

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 see. There is even a deer park in Sanya.

There are about 80 pyramids in Egypt.

Will there be a football match in your school next week?

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