`Answer:`

`1.` I chatted with my friends yesterday.

`@` yesterday: DHNB thì QKĐ

`2.` Did you play hide and seek last Sunday?

`@` last Sunday: DHNB thì QKĐ

`3.` Mai watched cartoons on TV last week.

`@` last week: DHNB thì QKĐ

`4.` We had nice food and drink at Mai's party last sunday.

`@` last sunday: DHNB thì QKĐ

`5.` What did they do in the park yesterday?

`@` yesterday: DHNB thì QKĐ

`6.` He went to cinema with his parents last night.

`@` last night: DHNB thì QKĐ

`7.` She bought a comic book at the bookshop last wednesday.

`@` last wednesday: DHNB thì QKĐ

`8.` Last Friday, my school had sports festival.

`@` last Friday: DHNB thì QKĐ

`9.` Hoa swam in the sea yesterday.

`@` yesterday: DHNB thì QKĐ

`10.` I was Phu Quoc island last holiday.

`@` last holiday: DHNB thì QKĐ

`===========`

`+` Cấu trúc thì Quá khứ đơn:

`-` với động từ:

`(+)` Khẳng định: S + Ved/V2

`(-)` Phủ định: S + didn't + V_nguyên mẫu

`(?)` Nghi Vấn: Did + S + V_nguyên mẫu?

`-` với tobe:

`(+)` Khẳng định: S + was/were +...

`(-)` Phủ định: S + was/were + not +...

`(?)` Nghi Vấn: Was/Were + S +...?

`-` Khi tobe là was thì danh từ nó là: I/ she/ he/ it/ N(Số ít)

`-` Khi tobe là were thì danh từ nó là: They/ we/ you/ N(số nhiều)

`-` Diễn tả hành động đã chấm dứt ở quá khứ và ko còn xảy ra ở hiện tại

`C`ấu trúc chủ yếu : Thì QKĐ :

`-` KĐ : S + Ved / V2 `-` S + was / were + adj / n

`-` PĐ : S + didn't + V `-` S + wasn't / weren't + adj / n

`-` NV : Did + S + V ? `-` Was / Were + S + adj / n ?

`=>` `DHNB` : yesterday , ago , last , ...

`1`.I chatted with my friends yesterday

`2`.Did you play hide and seek last Sunday ?

`3`.Mai watched cartoons on TV last week

`4`.We had nice food and drink at Mai's party last Sunday

`5`.What did they do in the park yesterday ?

`6`.He went to the cinema with his parents last night

`7`.She bought a comic book at the bookshop last Wednesday

`8`.Last Friday , my school had sports festival

`9`.Hoa swam in the sea yesterday

`10`.I was in Phu Quoc island last holiday

`\text{@ Tails347}`