1. Stas listened to music last night. 2. Stas didn't listen to music last night. 3. Did Stas listen to music last night? 4. Vitaly didn't play soccer. 5. Masha painted a picture. 6. We didn't visit a friend. 7. Did Alex watch a film? 8. Did the children help their mum? 9. Varya danced with her friend.