1.
(+) He didn't write a book.
(?) Did he write a book?
2.
(+) She wasn't my boss.
(?) Was she my boss?
3.
(+) They built a new house.
(?) Did they build a new house?
4.
(+) I was at the concert last Sunday.
(?) Was I at the concert last Sunday?
5.
(+) You bought clothes in this clothes shop.
(?) You didn't buy clothes in this clothes shop.
6.
(+) They were born in Korea.
(?) They weren't born in Korea.
7.
(+) He didn't swim in the lake.
(?) Did he swim in the lake?
8.
(+)We were not at the gym last week.
(?) Were we at the gym last week?
9.
(+) She went to her office by car.
(?) Did she go to her office by car?
10.
(+) He was a good boy.
(?) Was he a good boy?
