When they have put up that new building,it will spoil the view.从句用现在完成时，主句用将来时？

Question

怎么理解？

Answer 1

当他们建成那栋新的大楼时，风景和视线就会受损了。
前一句用现在完成时，其实表示的是未来会完成的事情，“当他们建成的时候”
主句就是表示将来的那时候，会。。。，用一般将来时
类似的：When you have finished your homework, I'll tell you why.

Answer 2

没有错。记住，主将从现中的现------包括一般现在时和现在完成时。

When they have put up that new building,it will spoil the view.
== After they have put up that new building, it will spoil the view.
== After they put up that new building,it will spoil the view.本回答被网友采纳

Answer 3

意思是当他们建筑起那座楼房的时候，它就破坏了视野。因为从句导致了主句将要发生的结果，所以这么用。