Answer:
You cannot keep me until you have given me. What am I?
u always follow me but I am rarely seen
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
I help you carry your books.
When you need me, you must find me. When you find me, you no longer need me. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.