Answer:
What goes through a door but never goes in and never comes out?
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
I am the building with the most number of stories.
This guy crossed a road and everyone wants an explanation.
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk