1. They went to Nha Trang last month.

 They didn't go to Nha Trang last month.

 Did they go to Nha Trang last month?

2. He played table tennis with his father.

 He didn't play table tennis with his father.

 Did he play table tennis with his father?

3. Lan saw you in the park last week.

 Lan didn't see you in the park last week.

 Did Lan see you in the park last week?

4. We were in the countryside last summer.

 We weren't in the countryside last summer.

 Were we in the countryside last summer?

5. Mrs. Robinson bought a poster.

 Mrs. Robinson didn't buy a poster.

 Did Mrs. Robinson buy a poster?

6. Liz enjoyed her vacation in Da Lat last year.

 Liz didn't enjoy her vacation in Da Lat last year.

 Did Liz enjoy her vacation in Da Lat last year?

7. Her aunt gave her a new skirt.

 Her aunt didn't give her a new skirt.

 Did her aunt give her a new skirt?

8. He was in our class two hours ago.

 He wasn't in our class two hours ago.

9. They watched a good footballmatch on TV last night.

(-) Did they watch a good footballmatch on TV last night?

10. Peter sent that letter to Marry yesterday morning.

(-) Did Peter send that letter to Marry yesterday morning?

11. Jane’s mother bought a new car last month.

(-) Did Jane’s mother buy a new car last month?

12. We visited Halong Bay three years ago.

(-) Did we visit Halong Bay three years ago?

13. They left for Hai Phong in 1999.

(-) Did they leave for Hai Phong in 1999?

14. They built a new school in my village ten month ago.

(-) Did they build a new school in my village ten month ago?

15. I borrowed a lot of book in the library last weekend.

(-) Did I borrow a lot of book in the library last weekend?

1.(-)They didn't go to Nha Trang last month.

   (?)Did they go to Nha Trang last month?

2.(-)He didn't play table tennis with his father.

  (?)Did he play table tennis with his father?

3.(-)Lan didn't see you in the park last week.

   (?)Did Lan see me in the park last week?

4.(-)We weren't in the countryside last summer.

   (?)Were you in the countryside last summer?

5.(-)Mrs.Robinson didn't buy a poster.

   (?)Did Mrs.Robinson buy a poster?

6.(-)Lan didn't enjoy her vacation in Da Lat last year.

   (?)Did Lan enjoy her vacation in Da Lat last year?

7.(-)Her aunt didn't give her a new skirt.

   (?)Did her aunt give her a new skirt?

8.(-)He wasn't in our class two hours ago.

   (?)Was he in our class two hours ago?

9.(-)They didn't watch a good football match on TV last night.

   (?)Did they watch a good football match on TV last night?

10.(-)Peter didn't send that letter to Mary yesterday morning.

     (?)Did Peter send that letter to Mary yesterday morning?

11.(-)Jane's mother didn't buy a new car last month.

     (?)Did Jane'smother buy a new car last month?

12.(-)We didn't visit Ha Long Bay three years ago.

     (?)Did you visit Ha Long Bay three years ago?

13.(-)They didn't leave for Ha Noi in 1999.

     (?)Did they leave for Ha Noi in 1999?

14.(-)They didn't build a new school in my village ten month ago.

     (?)Did they build new school in my village ten month ago?

15.(-)I didn't borrow a lot of books in the library last weekend.

     (?)Did you borrow a lot of books in the library last weekend?