Whose is this coat?
It's HERS.
I've got a ...
coat
He's got a ...
guide book
She's got a ...
magnifying glass
Whose is this map?
It's HIS.
Whose is this mobile phone?
It's HERS.
Whose is this notebook?
It's HIS.
Whose is this guide book?
It's THEIRS.
I've got a ...
water bottle
Whose is this backpack?
It's THEIRS.