Are these his shorts? (Yes)
Yes, they are
Is it a dress?
Yes, it is
What is this?
It's a T-shirt
Are these his trousers? (No)
No, they aren't
What are they?
They're shorts
What is this?
It's a dress
What are they?
They're trousers
Are these their socks? (Yes)
Yes, they are
These are _________________ socks . (his/her)
These are her socks.
Is it a T-shirt?
yes, it is
What are they?
They are socks
This is _________________ dress. (his/her)
This is her dress.