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英语将来过去式的用法为什么there is going to be a building there soon一定要用b

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英语将来过去式的用法
为什么there is going to be a building there soon一定要用be a building 而不能用build a building.求解析清楚简洁一点.
英语将来过去式的用法为什么there is going to be a building there soon一定要用b
你这是两个问题,逐一回答如下:
1)第一个问题
  不能说将来过去时,应该是过去将来时,其结构是 “would + 动词原形”,指的是发生在过去某个时候以后的行为.如:
He said to me that his mother would come and see him soon. [过去将来时would come and see 发生在said 以后]If I were you, I would not make friends with him.  要是我是你,我就不会和去他交朋友.[虚拟语气的过去将来时would not make在虚拟动词 were 以后]
2)第二个问题
  There is going to be a building there soon 用的是存在句 there be,其结构是:
引导词:there谓语动词:is going to be主语:a building状语:there soon
  句子的含义是 “那里不久会有(存在)一座楼”.如果改为 build a building,主语必须改用 “人”, 如 We are going to build a building. 意思是 “我们打算盖一座楼”.这两句话的区别是显而易见的.