Answer:
Something wholly unreal, yet seems real to I. Think my friend, tell me where does it lie?
I hide but my head is outside.
A house with two occupants, sometimes one, rarely three. Break the walls, eat the boarders, then throw away me.
What is as big as you are and yet does not weight anything?
He has married many women, but has never been married. Who is he?
What is so fragile that saying its name breaks it?