`Answer:`

`1,`

`(-)` I didn't write an essay in math class this morning

`(?)` Did you write an essay in math class this morning?

`2,` 

`(-)` She didn't watch TV yesterday morning 

`(?)` Did she watch TV yesterday morning?

`3,` 

`(-)` He and you weren't in the English club last Monday

`(?)` Were he and you in the English club last Monday?

`4,`

`(-)` They didn't eat noodles an hour ago

`(?)` Did they eat noodles an hour ago?

`5,`

`(-)` We didn't always have a nice time on the Christmas holiday in the past

`(?)` Did you have a nice time on the Christmas holiday in the past?

`6,` 

`(-)` My mom didn't decorate the Christmas tree

`(?)` Did your mom decorate the Christmas tree?

`7,`

`(-)` She didn't buy a new shirt yesterday

`(?)` Did she buy a new shirt yesterday?

`8,` 

`(-)` We weren't late for school

`(?)` Were you late for school?

`9,` 

`(-)` He didn't take his children to the museum last weekend

`(?)` Did he take his children to the museum last weekend?

`10,` 

`(-)` I didn't make a cushion for my armchair

`(/)` Did you make a cushion for my armchair?

_________________________________________

$\text{*Past Simple}$

`@` Với ĐT tobe:

`(+)` $\text{S + was/were + O.....}$

`(-)` $\text{S + was/were + not + O.....}$

`(?)` $\text{Was/Were + (not) + S + O......}$

`@` Với ĐT thường:

`(+)` $\text{S + Vpp}$

`(-)` $\text{S + didn't + V}$

`(?)` $\text{Did + (not) + S + V}$

`-` DHNB: yesterday, last (week, month, year, ....), ago, ...

`#TD`

Đáp án + Giải thích các bước giải:

1.

(-) I didn't write an essay in math class this morning. 

(?) Did you write an essay in math class this morning?

2.

(-) She didn't watch TV yesterday morning. 

(?) Did she watch TV yesterday morning? 

3. 

(-) He and you weren't in the English club last Monday. 

(?) Were I and he in the English club last Monday?

4.

(-) They didn't eat noodles an hour ago.

(?) Did they eat noodles an hour ago? 

5.

(-) We didn't always have a nice time on the Christmas holiday in the past. 

(?) Did you always have a nice time on the Christmas holiday in the past? 

6.

(-) My mom didn't decorate the Christmas tree. 

(?) Did your mom decorate the Christmas tree? 

7.

(-) She didn't buy a new shirt yesterday. 

(?) Did she buy a new shirt yesterday? 

8.

(-) We weren't late for school. 

(?) Were we late for school? 

9.

(-) He didn't take his children to the museum last weekend. 

(?) Did he take his children to the museum last weekend? 

10.

(-) I didn't make a cushion for my armchair. 

(?) Did you make a cushion for your armchair? 

Công thức của thì qkđ: 

(+) S + V(ed/bqt) 

(-) S + didn't + V(nguyên)

(?) Did + S + V(nguyên)? 

_____ Chúc bạn học tốt! _____