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

1. - He didn't write a book
    ? Did he write a book?
2. - She wasn't my boss
     ? Was she your boss?
3. + They built a new house
      ? Did they build a new house?
4. + I was at the concert last Sunday
     ? Were you at the concert last Sunday?
5   + I bought clothes in this clothes shop
      - I didn't by 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 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 buy
     ? Was he a good buy?