be 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。
be动词的用法：be （be/is/are/am/was/were) 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) 例句对照
【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. 这个男子是一位科学教师 2. Mary's new dresses are colourful. 玛丽的新衣服色彩鲜艳
3. I have been there before. 我以前去过那里
4. My mother is watching TV in the room. 母亲现在在客厅看电视
【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.】“情态动词+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
追问谢谢:-P
追答Be动词的用法：
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
1） be +现在分词，构成进行时态，例如：
They are having a meeting. 他们正在开会。 2) be + 过去分词，构成被动语态，例如：
The window was broken by Tom.. 窗户是汤姆打碎的。 3） be + 动词不定式，可表示下列内容： a. 表示最近、未来的计划或安排，例如：
He is to go to New York next week.. 他下周要去纽约。 说明： 这种用法也可以说成是一种将来时态表达法。 b. 表示命令，例如：
You are to explain this. 对此你要做出解释。 c. 征求意见，例如：
How am I to answer him? 我该怎样答复他？ d. 表示相约、商定，例如：
We are to meet at the school gate at seven tomorrow morning. 我们明天早晨7点在校门口集合。
现在进行时：
构成:主语+be+动词ing〔现在分词〕形式 第一人称+am+v-ing 第二人称+are+v-ing 第三人称+is+v-ing