1 Is my classmate a good person? My classmate isn't a good person.
2 Were we at the cinema last night? We were not at the cinema last night
3 Is it her favourite subject? It isn't her favourite subject
4 Were they the best friends long time ago? They were not the best friends long time ago
5 Is the weather is warm enough to stay inside? The weather isn't warm enough to stay inside
6 Is the market still closed? The market isn't still closed
7 Was she in a good mood a day before? She wasn't in a good mood a day before
8 Were those people at the hospital? Those people were not at the hospital.