Answer:
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
There is one in every corner and two in every room.
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
Roast, boast, coast, post. What do you put in a toaster?
What can travel all around the world without leaving its corner?
What did the piece of wood say when he saw the screwdriver and screws approaching?