1. He didn't open the window before classes. Did he open the window before classes?
2. They weren't in Kiev last week. Were they in Kiev last week?
3. My children haven't got a lot of friends. Have my children got a lot of friends?
4. There isn't a blackboard in our classroom. Is there a blackboard in our classroom?
5. There wasn't a telegram on the table. Was there a telegram on the table?