6.1
2. doesn't play the piano
3. You don't know the answer.
4. She doesn't work very hard.
5. They don't do the same thing every day.
6.2
3. don't know 4. She doesn't love him. 5. They don't speak English. 6. I want it. 7. She wants them. 8. He doesn't live in Rome.
6.3
1. Carol doesn't like classical music. I (don't) like classical music.
2. Bill and Rose don't like boxing. Carol likes boxing. I (don't) like boxing.
3. Bill and Rose don't like horror films. Carol likes horror films. I (don't) like horror films.
4. Bill and Rose like dogs. Carol doesn't like dogs. I (don't) like dogs.
6.4
2. don't sell 3. doesn't drive 4. don't go 5. doesn't wash 6. doesn't cost 7. doesn't play 8. don't know 9. doesn't wear 10. don't see