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