1. I have not met him before
Have I met him before?
2. They haven’t learned the new rule
Have they learned the new rule?
3. He hasn’t finished his work
Has he finished his work?
4. The boy hasn’t woken up
Has the boy woken up?
5. She hasn’t made this mistake before
Has she made this mistake before?
6. They haven’t had a long walk today
Have they had a long walk today?