Сотавить 2 предложения во времени present continuous + - ? 2 кратких ответа !

Положительные : my sister is watching tv now, my brother is reading an interesting book right now
Отрицательные : my sister isn't watching tv now, my brother isn't reading an interesting book right now
Вопросительные : is my sister watching tv now? Is my brother reading an interesting book right now?
Краткие ответы : yes, she is, no, he isn't