whether one can; whether it is possible

No one can deny the fact.

I can neither confirm nor deny that.

Is it possible to indicate a date on which a language came into life? "What a question!" you will be inclined to say. And yet such a date exists: the 26th of July, the Day of Esperanto. On this day in 1887 appeared in Warsaw a booklet by Ludwik Lejzer Zamenhof about the "International Language".

It is yet to be seen whether this plan will succeed or not.

Should we play?