1)They didn't discuss the terms of delivery last week.
Did they discuss the terms of delivery last week?
2)They didn't receive this flat five years ago.
Did they receive this flat five years ago?
3)She didn't buy this television last Sunday.
Did she buy this television last Sunday?
4)The manager wasn't at our office yesterday.
Was the manager at our office yesterday?
5)He didn't speak at the meeting about it.
Did he speak at the meeting about it?
6)They didn't come home at eleven.
Did they come home at eleven?
7)I didn't send her a letter the other day.
Did I send her a letter the other day?