Jawaban:

A. 1. (-) I didn't play football yesterday

(?) Did you played football yesterday?

2. (-) She didn't wake up early in the morning

(?) Did she woke up early in the morning?

3. (-) You didn't write a letter just now

(?) Did you just wrote a letter just now?

4. (-) They didn't go to the office early

(?) Did they went to the office early?

5. (-) You didn't sing those songs for me

(?) Did you sang those songs for me?

B. 1. (+) We ate some food yesterday

(?) Did you ate some food yesterday?

2. (+) My father lived in California

(?) Did your father lived in California?

3. (+) They spoke good English

(?) Did they spoke good English?

4. (+) Those students finished their homework

(?) Did those students finished their homework?

5. (+) My cousin bought this mobile phone for you

(-) Did my cousin bought this mobile phone for you?

C. 1. (+) John played football yesterday

(-) John didn't play football yesterday

2. (+) I enjoyed the flight

(-) I didn't enjoy the flight

3. (+) My mother cooked cookies yesterday

(-) My mother didn't cook cookies yesterday

4. (+) My students watched the movie

(-) My students didn't watch the movie

5. (+) He went to Spain last year

(-) He didn't go to Spain last year

semoga membantu :)