`\text{Quá khứ đơn}`

$\text{Với ĐT to be: S + was(not)/were(not) + O.}$  

$\text{Với ĐT thường:}$

$\textit{(+) S + Ved/VPI + (O).}$  

$\textit{(-) S + didn't + Vinf + (O).}$

$\textit{(?) Did + S + Vinf + (O)?}$

`1.` was

`\text{nhận bt: In the past}`

`2.` were

`\text{nhận bt: an hour ago}`

`3.`Did `-` spend

`\text{nhận bt: last summer}`

`4.`wrote

`\text{nhận bt: last Monday}`

`5.` didn't come

`\text{nhận bt: last Sunday}`

1 was 

Ta chia thì QKĐ tobe : S + was / were + ...

Mà a terrible storm là số ít nên đi với was

DHNB : in the past 

2 were

Ta chia thì QKĐ tobe : S + was / were

Mà peter and daisy là số nhiều nên đi với were

DHNB : an hour ago

3 did - spend

Ta chia thì QKĐ Nghi vấn : did + S + V nguyên mẫu

DHNB : last summer

4 wrote

Ta chia thì QKĐ  :S + V-ed / v2

DHNB ;last monday

5 didn't come

Ta chia thfi QKĐ phủ định : S + didn't + V nguyên mẫu

DHNB : last sunday