1. (-) They weren't in Rio last summer.
(?) Were they in Rio last summer?
2. (-) We didn't do our exercise this morning.
(?) Did you do your exercise this morning?
3. (-) My parents didn't come to visit me last July.
(?) Did your parents come to visit you last July?
4. (-) The hotel wasn't expensive.
(?) Was the hotel expensive?
5. (-) I didn't have a bicycle when I was young.
(?) Did you have a bicycle when you were young?
6. (-) The children didn't go to the zoo yesterday.
(?) Did the children go to the zoo yesterday?