there be反义疑问句there be 句型是倒装,那为什么反义是be there?而不是用真正的主语问

有情态动词助动词等的就不用be了.如：
There used to be a tall tree,后接did not there?

there is going to be sth,isn't there?
there are going to be sth,aren't there?
there will be sth,won't there?
there is ***,isn't there?
there are***,aren't there?
There is sth,isn...

你所谓的真正主语是形式主语，there be才是真正主语

there be 句型不是倒装 表示某地有某物 后面的名词不过是指“某物”