2 I am not learning Russian. (-)
3. Is it snowing?. (?)
4. They are walking in the park. (+)
5. Sophie isn`t eating berries. (-)
6. Is mother vacuum-cleaning? (?)
7. Jenny is writing a postcard. (+)
8. We aren`t swimming in the swimming-pool. (-)
9. I am listening to music. (+)
10. Is Kevin working? (?)
11. The nurse is feeding the patient. (+)
12. Is the wind blowing? (?)
13. She isn`t singing a lullaby. (-)
14. Are the boys riding horses? (?)
15. They aren`t building a new house. (-)