Перевести в отрицательную форму,задать специальный вопрос и специальный вопрос к подлежащему , задать общий вопрос:
1.She is playing tennis now
2.They are watching TV now
3.I make my bed every morning
4.He studies at school
(можно с переводом)

1 Is she playing tennis now? She isn't playing tennis now.What is she doing now? Who is playing tennis now?2 They aren't watching TV now.Are they watching TV now? What are they doing now? Who is watching TV now?3 I don't make my bed every morning.Do I make my bed every morning?What did I do every morning?Who makes my bed every morning?4 He doesn't study at school.Does he study at school? Where does he study?Who studies at school?