Answer:
What is it that no man ever saw, which never was, but always will be?
What gets wetter and wetter the more it dries?
What kind of cup doesn't hold water?
What occurs four times in every week, twice in every month, only once in a year but never in a day?
No matter how little or how much you use me, you change me every month. What am I?
How do you know if a sniper likes you?