there be 结构的将来时如果用be going to 表示,何时用There are going to be?

问题描述:

there be 结构的将来时如果用be going to 表示,何时用There are going to be?

一般情况均可使用,但多用于表示有迹象表明要发生的事情.例如:
There is going to be nothing left.
There is going to be rain.