8.1

2. No, she isn't.

Yes, she does.

She's playing the piano.

3. Yes, he does.

Yes, he is.

He is cleaning a window.

4. No, they aren't.

Yes, they do.

They're watching TV.

8.2

2. don't

3. are

4. does

5. is, don't

6. do

7. does

8. doesn't

8.3

4. is singing

5. she wants

6. do you read

7. you are sitting

8. I don't understand

9. I am going, are you coming

10. does your father finish

11. I am not listening

12. he is cooking

13. doesn't usually drive, usually walks

14. doesn't like, she prefers