`1.` Yesterday I went to the supermarket with my mother. We bought a lot of things 

`2.` We didn't go to school last Friday because it was a holiday

`3.` Did your children join in the sports competition last week?

`-` Cấu trúc thì Quá Khứ Đơn:

`-` Động từ thường:

`(+)` S + V2/ed + O

`(-)` S + didn’t + V..

`(?)` Did + S + V..?

`-` Dấu hiệu nhận biết: in, last, ago, yesterday,…

`1`. Yesterday, I went to the supermarket with my mother. We bought a lot of things.

`-` yesterday: dấu hiệu thì QKĐ

`-` Câu khẳng định ( thì QKĐ): S+ Ved/ V2+...

`2`. We did not go to school last Friday, because it was a holiday.

`-` Cấu trúc: Kết quả, because+ nguyên nhân

`-` last Frinday: dấu hiệu thì QKĐ

`-` Câu phủ định ( thì QKĐ, động từ thường): S+ did not+ V+...

`-` Câu khẳng định ( thì QKĐ, động từ tobe): S+ was/ were+ N/ adj

`3`. Did your children join in the sports competition last week?

`-` last week: dấu hiệu thì QKĐ

`-` Câu nghi vấn ( thì QKĐ): Did+ S+ V+...?