there is going to be a meeting为什么不能用there is going to have a meeting

there is going to be a meeting为什么不能用there is going to have a meeting

 

 

（1）把is going to去掉来看是不是就成了there is a meeting而不能用there have a meeting ！而is going to表示将会

 

(2)这是there be 的将来时，
there be的将来时：there is going to be
there will be
当然不能用have 了
这是there be 句型 

(3)there be 句型 就表示有 存在的意思 没有必要再用have了