3)
1. aren't buying
2. isn't learning
3. isn't looking
4. aren't selling
5. aren't drinking
6. aren't working
7. aren't running
8. isn't going
4)
1. What is Jessica doing?
2. Why are John and Patrick laughing?
3. What book are you reading?
4. What are we watching?5. Where are they staying
6. Why are we sitting in the dark?
7. Where are they waiting?
8. What are you selling?