3. be+going to do，表示"打算或将要做某事"，be有现在和过去两种形式 。
如：
We are going to plant trees in the park.
I didn't know if she was going to come here.
4. be+to do，表示"按计划安排将要做某事" 。
如：
The new shop is not to be opened till next Monday.
One night an angel came to Mary and told her that she was to have this special boy.
功能三，there be
there be句式为：
there be+主语部分＋状语部分，表示"某处存在某物"，be常用现在时，过去时和将来时等 。
如：
Oh, cool! And there are many things to see.
There is even a deer park in Sanya.
There are about 80 pyramids in Egypt.
Will there be a football match in your school next week?
功能四，实义be
可以将be视为实义动词，因为它具有实际的词义，如"成为;做;发生;举行;逗留;到达"等 。
如：
His daughter wants to be a doctor for animals in her twenties.
Kate's birthday party will be at half past six this evening.
Jim has been in China for more than two years, but he has not yet been to Yichang.
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：
“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.
be的变化形式：
1.am/ is/are
2.was/were
3.have/has been
4.had been
5.am/is/are going to be
6.there is/are/waas/were going to be
7.there seem to be
8.It remains/remined to be
等
助动词be的用法
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 。
English is becoming more and more important. 英语现在越来越重要 。
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 。
English is taught throughout the world. 世界各地都教英语 。
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