be动词的用法大全

be [bi:](be/is/are/am/was/were)

现在时
I am, you are, he is, we are, you are, they are  过去时 I was, you were, he was, we
were, you were, they were (过去时否定缩略式 wasn't, weren't),过去分词been,现在分词being

英语的“be”是个特殊动词;有些语言,如马来文等,并没有“be”这样的动词。

“Be”除了原形的“be”之外,还有另外七种形式:am,
is, are, been, being, was, were.

在句子中,“be”可以是主动词(The
Principal Verb)或助动词(The Auxiliary Verb)

#FormatImgID_0#

#FormatImgID_1#【当做助动词时,“be”在性质上属于接系动词(The
Linking Verb), 后面要有名词、形容词、地方副词或短语作补足语(The
Complement)。】例如:

The
man is a science teacher.

这个男子是一位科学教师。

Mary's
new dresses are colourful.

玛丽的新衣服色彩鲜艳。

I
have been there before.

我以前去过那里。

My
mother is in the kitchen now.

母亲现在在厨房。

【这四个都是陈述句,可以变成疑问句,方法简单,把主语和“be”或助动词对换位置即可:

Is
the man a science teacher?

Are
Mary's new dresses colourful?

Have
I been there before?

Is
mother in the kitchen now?

【当“be”要在祈使句中出现时,它必须借助
助动词“do”或“don't”之助,如:

Don't
be silly!

Do
be obedient!

Don't
be a fool!

【“Be”有两种缩写法,如下:

He's
not...../He isn't....

You're
not...../You aren't...

【但“am
+ not”的缩写法只有一个:

I'm
not.

有人用“ain't”,
但这并不是标准英语。

谈过了“be”作主动词的功能,现在看看“be”作助动词时,有些什么用法:

【1.】“Be
+ 现在分词”以组成进行式时态(Continuous
Tenses),如:

Tony's
maid is washing his new car.

The
children are playing in the field.

Samuel
was eating when I came in.

【2.】“事/物人
+Be + 过去分词”以组成被动语态(The
Passive Voice),如:

Her
money in the drawer was stolen.

A
number of good jobs are taken up by foreigners.

David
studied in Taiwan but has been trained as a language lecturer in
America.

be动词有时在句中的成分是助动词,句中动词用现在分词,例如:

I
am reading a book now.

我正在读书。

He
is watching TV now.

他正在看电视。