`1. ( - )` I didn't go to school yesterday. 

`( ? )` Did you go to school yesterday?

`2. ( - )` She didn't wear a letter to her friend.

`( ? )` Did she wear a letter to her friend?

`3. ( - )` My grandfather didn't help her.

`( ? )` Did your father help her?

`4. ( - )` She didn't wear a uniform to work.

`( ? ) ` Did she wear a uniform to work?

`5. ( - )` She didn't eat bread for breakfast yesterday.

`( ? )` Did she eat bread for breakfast yesterday?

`6. ( - )` We didn't visit Hanoi last summer.

`( ? )` Did you visit Hanoi last summer?

`7. ( - )` They weren't at school yesterday.

`( ? )` Were they at school yesterday?

`8. ( - )` She didn't have noodles for breakfast this morning.

`( ? )` Did she have noodles for breakfast this morning? 

`9. ( - )` His parents don't always take them to the zoo.

`( ? )` Do his parents always take them to the zoo?

`10. ( - )` Lan and Mai didn't often watch TV in the afternoon.

`( ? )` Did Lan and Mai often watch TV in the afternoon? 

`-` Cấu trúc thì QKD:

`-` Với tobe

`( + )` S + was/were + N/adj/... + O

`( - )` S + wasn't/weren't + N/adj/... + O

`( ? )` Was/Were + S + N/adj/... + O?

`-` Với V thường:

`( + )` S + V-ed + O

`( - )` S + didn't + V-inf + O

`( ? )` Did + S + V-inf + O?

`-` Cấu trúc thì HTD:

`( + )` S + V-s/es + O

`( - )` S + don't/doesn't + V-inf + O

`( ? )` Do/Does + S + V-inf + O? 

1. I went to school yesterday.

- I didn't go to school yesterday.

- Did you go to school yesterday?

2. She wrote a letter to her friend?

- She didn't write a letter to her friend.

- Did she write a letter to her friend?

3. My grandfather helped her.

- My grandfather didn't help her.

- Did my grandfather help her?

4. She wore uniform to work. 

- She didn't wear uniform to work.

- Did she wear uniform to work?

5. She ate bread for breakfast yesterday.

- She didn't eat bread for breakfast yesterday.

- Did she eat bread for breakfast yesterday?

6. We visited Hanoi last summer. 

- We didn't visit HN last summer.

- Did we visit HN last summer?

7. They were at school yesterday. 

- They weren't at school yesterday.

- Were they at school yesterday?

8. She had noodles for breakfast this morning.

- She didn't have noodles for breakfast this morning.

- Did she have noodles for breakfast this morning?

9. His parents always took them to the zoo.

- His parents didn't always take them to the zoo.

- Did his parent always take them to the zoo?

10. Lan and Mai often watched TV in the afternoon.

- Lan and Mai didn't often watch TV in the afternoon.

- Did Lan and Mai often watch TV in the afternoon?