Ответ:

1. Is he from Beijing? No, he's not from Beijing
2. Was he in bed? No, he was not in bed.
3. Will you be very late? No, we won't be very late.
4. Is it very big? No, it's not very big.
5. Were they at university? No, they weren't at university.
6. Was she in her office? No, she wasn't in her office.
7. Will they have coffee? No, they won't have coffee.
8. Are they happy? No, they're not happy.