1 Is Irvin working on an article about sports and health?
Yes, he / Irvin is working on an article about sports and health.
2 Are you learning to play the piano?
No, I’m / I am not learning to play the piano.
3 Are Nese and Ertug working on the e-zine?
No, they / Nese and Ertug aren’t / are not working on the e-zine.