be动词的用法以及规则

Question

如题所述

Answer 1

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。根据句子中不同的人称、数和时态，应该选择相应的be动词。
我(I)用am，你(you)用are， is连着他(he)，她(she)，它(it)；
这些是固定用法：
I am a boy. (你不能说 I is a boy)
You are a student.
He is a boy.
She is a girl.
It is a cat.
单数名词用is，复数名词全用are。(主语个数是一个时，谓语用单数is，主语个数为2个或以上，谓语用复数are.)如：
The book is over there.(一本书）
The books are over there.（多本书）
变疑问，往前提，句末问号莫丢弃。(陈述句中谓语为is,are,am时，变疑问句只将其提前）如：
It is a book.变为：Is it a book?
变否定，更容易， be后not莫忘记。如：
It is a book.变为: It is not a book.(否定句）
疑问否定任你变，句首大写莫迟疑。如：
It is a book.变为：Is not it a book?(疑问否定句）

Answer 2

亲爱的楼主：

be作助动词用的形式如下：
①am, is, are, was, were
②助动词+be：shall be, will be, can
be, etc.
③have/has/had + been（完成时）
④am, is, …being（进行时）

（1）表达进行时态
句型 be + V-ing…（进行时态）
例：What are you
reading?
（你正在阅读什么？）
I am reading a magazine.
（我正在阅读杂志。）
例：He will be
taking a walk in the park at this time tomorrow
morning.
（明天早晨此时他将会正在公园散步。）
例：She has been teaching English in our school
for years.
（她已在我们学校教英语许多年了。）
解说
第一例句是表达现在进行时，第二例句是将来进行时，第三例句是现在完成进行时。
（2）表达被动语态
句型 be +p.p.
…（被动语态）
例：English is spoken in both Canada and the United
States.
（加拿大和美国都讲英语。）
例：Those keys were found in your
drawer.
（那些钥匙是在你的抽屉里找到的。）
例：It can be done much faster in this
way.
（这件工作用这个方法可以更加快速地做好。）
“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).

当主动词时，“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：

1. The man is a science teacher.

2. Mary's new
dresses are colourful.

3. I have been there before.

4. Mother is
in the kitchen now.

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：

5.
Is the man a science teacher?

6. Are Mary's new dresses colourful?

7. Have I been there before?

8. Is mother in the kitchen now?

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

9. Don't be silly!

10. Do be obedient!

11. Don't be a fool!

“Be”有两种缩写法，如下：

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

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

但“am + not”的缩写法只有一个：

14. 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：

15. Tony's maid is washing
his new car.

16. The children are playing in the field.

17.
Samuel was eating when I came in.

18. We have been living here since
1959.

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

19. Her money
in the drawer was stolen.

20. A number of good jobs are taken up
byforeigners.

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

22. Can all the wonderful birds be found
in our Bird Park?

23. The disobedient boy was told to stand out- side
the classroom.

24. Steps are being taken to reduce traffic con- gestion
during peak hours.

25. Dishonest students will be immediately dealt
with.
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