whose
US /huːz/
UK /huːz/

1.
belonging to or associated with which person
:
•
Whose book is this?
•
Whose turn is it to do the dishes?
2.
belonging to or associated with which thing
:
•
The company, whose profits have fallen, is laying off workers.
•
The car, whose engine was smoking, pulled over to the side of the road.
1.
the person or thing belonging to whom
:
•
I found a wallet. Whose is it?
•
They argued about whose was the better idea.