1.
(-) He didn't write a book.
(?) Did he write a book?
2.
(-) She wasn't my boss.
(?) Was she your boss?
3.
(+) They build a new house.
(?) Did they build a new house?
4.
(+) I wasn’t at the concert last Sunday.
(?) Were you at the concert last Sunday?
5.
(+) I bought clothes in this little shop.
(-) I didn't buy clothes in this little shop.
6.
(+) They were born in Korea.
(-) They weren't born in Korea.
7.
(-) We didn't swim in the lake.
(?) Did you swim in the lake?
8.
(-) We weren't at the gym last week.
(?) Were you 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?