Are you doing sums? Yes, I am || No, I am not
Is your sister painting? Yes, she is. || No, she isn’t
Are your parents watching TV? Yes, they are. || No, they aren’t
Is your brother swimming? Yes, he is. || No, he isn’t
Are your grandparents running? Yes, they are. || No, they aren’t
Is your dog sleeping? Yes, it is. || No, it isn’t