possibly

This last task is possibly the most difficult.

这最后一项任务也许是最难的。

It will take three weeks, possibly longer.

要花三个星期，也许更久。

‘Will you be here tomorrow?’ ‘Possibly.’

“你明天到这儿来吗？”“也许吧。”

‘Was it murder?’ ‘ Quite possibly (= it is very likely ) .’

“是谋杀吗？”“很可能是。”