1. — They’ve just bought a new car. They haven't just bought a new car. Have they just bought a new car?
2. — Barbara has moved into a new flat— Barbara hasn't moved into a new flat. Has Barbara moved into a new flat?
3. — I have passed the exam. I haven't passed the exam. Have I passed the exam?
4. — David has grown a beard. — David hasn't grown a beard. Has David grown a beard?
5. — Michael has just returned from America. — Michael hasn't just returned from America. Has Michael just returned from America?
6. — He has just given up smoking. — He hasn't just given up smoking. Has he just given up smoking?
7. — We’ve bought a dog. We haven't bought a dog. Have we bought a dog?
8. — Nick has already fed his rabbit. Has Nick already fed his rabbit? Nick hasn't already fed his rabbit.