Answer:
What is yours but only used by others?
What is the only question you can't answer yes to?
What goes up the hill and down the hill, And spite of all, yet stand still?
What is the building that you leave without ever having entered.
What is as big as you are and yet does not weigh anything?
I have a few points but we're not competing. I'll help you win when you're eating. What am I?