这听起来是个适合居住的好地方，但说不定——我们可能不喜欢它。

It sounds like a nice place to live, but ___you ___never ___know – we may not like it.

说不定，我可能会发现有趣的东西并改变我的观点。

___You ___never ___know, maybe I'll find something interesting and I'll change my point of view.

他可能仍然会出现；说不定。

He might still show up; ___you ___never ___know.