1. (-) We didn't do our exercise this morning.
(?) Did you do your exercise this morning?
2. (-) The hotel wasn't very expensive.
(?) Was the hotel very expensive?
3. (-) I didn't have a bicycle when I was young.
(?) Did you have a bicycle when you were young?
4. (-) The children didn't go to the zoo yesterday.
(?) Did the children go to the zoo yesterday?
5. (-) Ernire didn't eat the last doughnut.
(?) Did Ernie eat the last doughnut?
6. (-) They didn't buy a new house last month.
(?) Did they buy a new house last month?