Answer:
You can have it, and be at it, But it never lasts forever.
I saw the dead bring forth the living. I saw the living bring forth the dead. What did I see?
What cannot talk but will always reply when spoken to?
It is a popular afterlife destination where you want to send people when you're mad at them.
Who has married hundreds but always been single?
I am a room that has a roof but no walls. What am I?