What is this?
This is a backpack.
This is my.......
notebook
Is this a book?
No, it isn't. It's a notebook.
Is this a rubber?
Yes, it is.
This is my.......
crayon
Is this a book?
Yes, it is.
This is my.......
rubber
Is this a crayon?
No, it isn't. It's a pencil.
This is my.......
book
This is my.......
pencil case