Mike: Hi, Helen. This is my study (书房)。
Helen: How nice! What's this?
Mike: It's a pencil case.
Helen: Is that a crayon in the pencil case?
Mike: No, it isn't. It's a pencil.
Helen: Is that a rubber in the desk?
Mike: Yes, it is.
Helen: Can I have a look?
Mike: Sure. Here you are.