这句为何倒装?

问题描述:

这句为何倒装?
I will see you tomorrow,should nothing intervene.

这是If真实条件句,表示对将来的假设.
If you should have any query,please don't hesitate to tell me.
这种情况习惯用倒装,成为
Should you have any query,...
这是语法,