there are many people are doing sth.这种句型一般是在对某个图片或场景的内容进行描述，一般用
现在进行时，让人有栩栩如生的感觉。
1、对现在正在发生的真实情况作描述
There are many students in the classroom right now.
2/对图片等虚拟场景做描述，显得生动。
---look at this picture.What are they doing?
---some are swimming ,others are flying kites.
there be的固定句型
1.There be +名词或代词+to do (+介词) 有某事要做
There are much housework to do.
2.There be + some/no+ trouble/difficulty ( in) doing sth/with sth. 做某事(没)有困难
There is no trouble finishing the task.
3. There be + some/no + doubt about/as to sth / that… 对某事(没)有疑问
There is no doubt about this question.
4. There is no sense/use/good/point (in) doing sth 做某事没有道理/用处/好处/意义
There is no sense talking too much.
5. There is no need (for sb.) to do sth/that… (某人)做某事没有必要
There is no need for me to apologize .
6. There is no chance/possibility to do sth/of doing sth./that… 没有做某事的机会/可能性
There is no chance to meet her again.
7 .There was no arguing with her. 没法和她争辩。
8. There is a time when...有做某事的一段时间
满意的话请尽快采纳，谢谢！