Answer:
You cannot keep me until you have given me. What am I?
I am an object which is used in baseball during the day I can't be seen at all
I belong to you but others use me more often than you do. What am I?
The more you add the less it weighs. What is it?
I work when I play and play when I work. What am I?
What never gets any wetter no matter how hard it rains?