be going to 和 be going to be 后面接什么词性?这个语法要怎么用?

问题描述:

be going to 和 be going to be 后面接什么词性?这个语法要怎么用?
It's going to snow today.It's going to hot today.
打错了,It's going to be hot today

主语 be going to do
be going to be+adj
sth将要发生