thì QKĐ ta có cấu trúc : 

cấu trúc đt tobe 

-> s + wás / were + ...

-> s + wasn't / weren't + ...

-> was / were + S + ...

cấu trúc đt thường 

-> s + v-ed / v2

-> s + didn't + V nguyên mẫu

-> did + s + V nguyên mẫu

1 stayed

2 went

-> dấu hiệu nhận bt : last night

3 had

-> dấu hiệu nhận bt : had

4 wás

-> my vacation là it nên + wás

5 visited

-> dấu hiệu nhận bt : last summer

6 were

7 bought 

8 saw

9 ate

10 talked

Bài `2:`

`1`. stayed

`2`. went

`3`. had 

`4`. was

`5`. visited

`6`. were

`7`. bought

`8`. saw

`9`. ate

`10`. talked 

* Cấu trúc: quá khứ đơn

- Với "tobe"

+) S + was/were + O 

- Với động từ thường

+) S + V2/ed