1)He was a doctor two year ago
(-)He wasn't a doctor two year ago
(?)Was he a doctor two year ago ?
2)They were students last year
(-)They weren't students last year
(?)Were they students last year ?
3)It was hot last night
(-)It wasn't hot last night
(?)Was it hot last night ?
4)The doors were opened last sunday
(-)The doors weren't opened last sunday
(?)Were the doors opened last sunday ?