1. They were in Rio last summer.

->They weren't in Rio last summer.

->Were they in Rio last summer?

2. We did our exercise this morning.

->We didn't do our exercise this morning.

->Did you do our exercise this morning?

3. My parents came to visit me last July.

->My parents didn't come to visit me last July.

->Did your parents come to visit you last July?

4. The hotel was very expensive.

->The hotel wasn't very expensive.

->Was the hotel very expensive?

5. I had a bicycle when I was young

->I didn't have a bicycle when I was young.

->Did you have a bicycle when you were young?

6. The children went to the zoo yesterday.

->The children didn't go to the zoo yesterday.

->Did the children go to the zoo yesterday?

7. Ernie ate the last doughnut.

-> Ernie didn't eat the last doughnut.

-> Did Ernie eat the last doughnut?

8. They bought a new house last month.

-> They didn't buy a new house last month.

-> Did they buy a new house last month?