3They were in Rio last summer.

(-) They weren't in Rio last summer.

(?) Were they in Rio last summer?

4. We did our exercise this morning.

(-) We didn't do our exercise this morning.

(?) Did we do our exercise this morning?

5. My parents came to visit me last July.

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

(?) Did my parents come to visit me last July?

6. The hotel was very expensive.

(-) The hotel wasn't very expensive.

(?) Was the hotel very expensive?

7. I had a bicycle when I was young.

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

(?) Did I have a bicycle when I was young?