什么是be动词?

如题所述

be动词意思是: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、数和时间,型态,应该选择相应的be动词。

be为连系动词,中心词义是"是",句型为"主+系+表"结构。Be除了原形的be之外,还有另外七种形式:am,is,are,been,being,was,were。要看语句的时态:

1、如果是一般过去时,就用was/were;

2、如果是一般现在时,就用am/is/are;

3、如果是一般将来时,就用will be。

扩展资料:

be动词不是表示动作,它主要说明主语的年龄、身份、性质或状态。在句子中不可独立作谓语,必须与名词、形容词、副词、介词短语等-起使用,成为句子的谓语。如:

1、Lily is thirteen years old.莉莉十三岁了。(be动词+名词)

2、His father is well now.他爸爸现在的身体不错。(be 动词+形容词)

3、Class is over.下课了。(be 动词+副词)

4、The door is on the left.门在左边。(be动词+介词短语)

参考资料来源:百度百科-be动词

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第1个回答  推荐于2017-11-21
be动词的一般现在时有三种形式,即:am, is, are。
1. 如果主语是第一人称I(我)时,be动词用am。
如:I am a student. 我是一名学生。
I am 还可缩写成I'm。如:
I'm David. 我是大卫。
2. 如果主语是you (你,你们), they (他们,它们,她们)或名词复数 (两个以上的人或物)时,be动词必须用are。
如:Are you twelve? 你是十二岁吗?
Tom and Lily are good friends. 汤姆和莉莉是好朋友。
They are at school. 他们在学校。
are与主语还可缩写。如: We are= We're, They are =They're, You are = You're。而are与 not可缩写成aren't。
如:They aren't students. 他们不是学生。但是am与not不能缩写。
3. 如果主语是单数名词、不可数名词或单数第三人称代词(he, she, it)时,be动词用is。
如:My mother is a teacher. 我的妈妈是一名老师。
He is a student. 他是一名学生。
is也可与主语缩写,如: He is = He's, My mother is = My mother's等。但是This is不可缩写。而is与not可缩写成 isn't。
如:This isn't a book. 这不是一本书。
根据以上叙述我们可以把动词的用法以口诀的形式表述出来:
我(I)是am,
你(you)是are,
剩下is留给她(she), 他(he), 它(it),
两个以上都用are。

[思路分析]
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)

[解题过程]
(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。)

参考资料:http://zhidao.baidu.com/q?word=be%B6%AF%B4%CA&lm=0&fr=search&ct=17&pn=0&tn=ikaslist&rn=10

本回答被提问者采纳
第2个回答  2009-07-29
be动词的用法
be
[bi:]
vi
现在时 I am, you are, he is, we are, you are, they are (缩略式 I'm, you're, he's, we're, you're, they're), (否定缩略式 I'm not, isn't, aren't), 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”是个特别动词;有些语言,如中文和马来文,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).
【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.
第3个回答  2011-06-09
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
is(过去式was),am(过去式was),are(过去式were)
第4个回答  2016-08-30
所谓"BE"动词,就是动词be的所有变化形式,它有:am,is,are,was,were,
be还有另外的变化形式:being,been