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菏泽中考英语知识点:Be动词定义及用法

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2014-01-06

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.

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.

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