Answer:
I am a shimmering field that reaches far. Yet I have no tracks and am crossed without paths.
He has married many women, but has never been married. Who is he?
What is always in front of you but can't be seen?
I reach for the sky but clutch to the ground. Sometimes I leave but I am always around.
There's a one-story house in which everything is green. Green walls green windows green doors. What color are the stairs?
No matter how little or how much you use me, you change me every month.