Answer:
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
The more of this there is the less you see. What is it?
When you take away the whole from me there is always some left.
Never resting, never still. Moving silently from hill to hill. It does not walk, run or trot. All is cool where it is not. What is it?
A thousand wheels but move I do not. Call me what I am call me a lot.
It rows quickly with four oars but never comes out from under his own roof. What is it?