Answer:
I am always in front of you, but yet I am never here. What am I?
I mirror your actions.
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
It rows quickly with four oars but never comes out from under its own roof. What is it?
I have hundreds of ears but cannot hear a thing. What am I?
No matter how little or how much you use me, you change me every month.