`1.` was buying

`2.` saw

`3.` turned

`4.` was slowling put

`5.` was carring

`6.` walked

`7.` picked

`8.` thought

`9.` was looking

`10.` dropped

`11.` had

`12.` noticed

`13.` was watching

`14.` hurried

`15.` were walking

`16.` ran

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`+` Cấu trúc thì Quá khứ đơn:
`(+)` Khẳn đinh: S + Ved/V2

`(-)` Phủ định: S + didn't + V_inf

`(?)` Nghi Vấn: Did + S + V_inf....?

`+` Cấu trúc thì Quá khứ tiếp diễn:
`(+)` Khẳn đinh: S + was/were + V_ing

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

`(?)` Nghi Vấn: Was/were + S + V_ing...?

$\text{1.}$ was buying

$\text{2.}$ saw

$\text{3.}$ turned

$\text{4.}$ was slowping put

$\text{5.}$ was scaring

$\text{6.}$ walked

$\text{7.}$ picked

$\text{8.}$ thought

$\text{9.}$ was looking

$\text{10.}$ dropped 

$\text{11.}$ had

$\text{12.}$ noticed

$\text{13.}$ was watching

$\text{14.}$ hurried

$\text{15.}$ were walking

$\text{16.}$ ran

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$\rightarrow$ Công thức thì quá khứ đơn:

+) S + V2/ed + O

-) S + did not + V + O

?) Did + S + V ?

$\rightarrow$ Với từ để hỏi: WH-word + did + S + (not) + V (nguyên mẫu)?

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$\rightarrow$ Công thức thì Quá khứ tiếp diễn:

+)S + was/were + V-ing

-)S + wasn’t/ weren’t + V-ing

?)Was/ Were + S + V-ing ?

$\rightarrow$ Với từ để hỏi: WH-word + was/ were + S + V-ing?

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$\text{Chúc bạn học tốt ặ :33}$