I hope we'll stay in touch with each other.这句话怎么改反意疑问句?

问题描述:

I hope we'll stay in touch with each other.这句话怎么改反意疑问句?
答案是don't you.
这个答案正确么,是不是特殊情况,
有没有什么规则?

I hope we'll stay in touch with each other.
是表建议,理解成don't you think so?