学习知识|be动词怎么用,什么情况下用be动词


be动词 该怎么用? be动词的用法

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.
归纳be动词的用法要详细 您好 , 领学网为您解答:
be动词包括一般形式am、is、are.主语为第一人称“我”时用am.主语为第二人称时用are.主语是单三人称时用is 。
第三人称单数有哪些:

1. 第三人称单数代词有:he, she, it 。
如:How old is she? 她多大了?
Is he at home today? 今天他在家吗?
2. 指示代词this, that 。
如:That's a Chinese car. 那是辆中国小汽车 。
3. 单数可数名词 。 如:Lucy, a cat, my book, an orange, the bag等 。
如:Lucy is a good girl. 露西是个好女孩 。
4. 不可数名词可被看作第三人称单数 。 如:There is some money in the purse. 在钱包里有些钱 。
5. 当数字或字母作主语时 , 看作第三人称单数 。 如:“6” is a lucky number. “6” 是个吉利数字 。
“I” is a letter. “I”是个字母 。 6. 数字的加、减、乘、除的结果常被看作第三人称单数 。
如:What is one and two? 一加二等于几?
Eight minus five is three. 八减五等于三 。
Be动词的用法口诀 :
我用am , 你用are , is连着他 , 她 , 它; 单数名词用is , 复数名词全用are 。 变疑问 , 往前提 , 句末问号莫丢弃 。 变否定 , 更容易 , be后not莫忘记 。 疑问否定任你变 , 句首大写莫迟疑 。

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