`@` Công thức thì QKĐ:
`+` Cấu trúc:

`(+)` Khẳng định: S + Ved/V2

`(-)` Phủ định: S + didn't + V_inf

`(?)` Nghi vấn: Did + S + V_inf...?

`-` với tobe:
`+` khi tobe là was thường đi với chủ ngữ ở dạng số ít: I/ It/ she/ he/ N(danh từ số ít)

`+` khi tobe là were thường đi với chủ ngữ ở dạng số nhiều: They/ we/ you/ N(danh từ số nhiều)

`->` Đáp án:

`2.` was

`3.` watched

`4.` went

`5.` had

`6.` visited

`7.` bought

`8.` ate

`9.` took

`10.` interviewed

`11.` didn't go

`12.` stayed

`13.` didn't come out

`14.` stopped

`2.` was

`3.` wat

`4.` went

`5.` had

`6.` visited

`7.` bought

`8.` ate

`9.` took

`10.` interviewed

`11.` didn't go

`12.` stayed

`13.` didn't come out

`14.` stopped

__________________________

`-` Áp dụng:

`+)` thì quá khứ đơn

`->` S + V2/ed + O.

`->` S + was/were + V + O.

`->` S + didn't + V + O.