Is this her book?
Yes, it is
Are these their balloons?
Yes, they are
Is this her dog?
No, it isn't
Is this her umbrella?
No, it isn't
Is this her cat?
Yes, it is
Is this his ball?
Yes, it is
Is this her book?
No, it isn't
Is this his umbrella
No, it isn't
Is this his hat?
Yes, it is
Is this her hat?
No, it isn't
Is this his dog?
Yes, it is