英语 look at the clouds ,there is going to be a storm

问题描述:

英语 look at the clouds ,there is going to be a storm
请问这里 为什么要加个be 直接 there is a going to a storm 不行吗

there is going to do sth.是固定句式
这里to do sth.是不定式,后面必须是动词原形的.
直接加sth.是错误的.