Answer:
If you've got me I'm everywhere. If you share me I'm nowhere. What am I?
By Moon or by Sun I shall be found. Yet I am undone if there's no light around.
When I am alive, people sing. When I am dead, people clap hands. What am I?
When it comes to me, you go on red and stops on green. What am I?
What goes up a chimney down but can't go down a chimney up?
I have feet on my head