Are these your sunglasses?
Yes, they are.
Are _____ your parents?
those. (Yes, they are)
Who are these girls?
They're (they are) my sisters.
Is that your mom?
Yes, it is! She's busy making dinner.
Who's that?
It's my teacher.
Is this your wallet?
Yes, it is.
Are these your keys?
Yes, they are.
What things do you have in your school bag?
I have a cell phone, wallet, keys, a pair of reading glasses, and an MP3 player!
What is this?
This is a notebook.
Are those your books?
Yes, they are.