it is going to be built. 这里的be是什么用法?谓语是哪个?

it is going to be built. 这里的be是什么用法?谓语是哪个? 类似于 Is it meant to be?句中非谓语动词be的用法! is going to be 的用法 be doing be is going to will用法的区别 there is going to be 中哪个是there be句型里面的 be be going to 的用法, be going to 的用法 Don't be another Mr.Going To Do!为什么这里用be?是什么用法? is going to be 和 are going to be的用法区别 to be built是什么结构 be going 如：what is it going to be? would be going to这是什么用法