Whose teacher is this?
their teacher
Whose cat is this?
Her cat
Whose Mom is this?
their Mom
Whose dog is this?
his dog
Whose pencil is this?
Her pencil
Whose Mom is this?
His Mom
Whose doll is this?
Her doll
Whose dog is this?
their dog
Whose book is this?
His book
Whose ball is this?
his ball
Whose car is this?
her car