副词 probably 与否定词连用时，习惯上是用于否定词之前，而不是用于其后。所以英语习惯上是说：

I probably won’t finish the work in time, but I’ll try my best.

The girl probably didn’t try hard enough.

而不会说：

I won’t probably finish the work in time, but I’ll try my best.

The girl didn’t probably try hard enough.

又如：

it couldn’t help, but then again, it probably couldn’t hurt.  它没什么用，不过可能也没危害。

This idea probably won’t work, but let’s try it anyway. 这个办法可能行不通，不过我们还是试试吧。

The origin of the universe will probably never be explained. 宇宙起源问题大概永远不会有答案。