1) No, he's not. He's watching television.
2) No, I'm not. I'm learning them by heart.
3) No, he's not. He's reading a newspaper.
4) No, they're not. They're talking with a friend.
5) No, I'm not. I'm going home.
6) No, she's not. She's listening to a concert.
7) No, I'm not. I'm writing a film script.
8) No, she's not. She's cooking.
