Is this your eraser?
No, it's not.
What's this?
eraser
What's this?
in
Where's the dog?
It's on the desk.
What's this?
pencil
Is this your pencil?
Yes, it is.
Is this your marker?
No, it's not .
What's this?
pen
What's this?
desk
What's this?
ruler
Where's the dog?
It's in the box.
What's this?
marker
What's this?
box
What's this?
book
What's this?
on
What's this?
under
Where's the dog?
It's under the desk.
Is this your ruler?
Yes, it is.
What's this?
chair