Cấu trúc chủ yếu : Thì QKĐ :

`-` ĐT Tobe :

`+` CKĐ : S + was / were + adj / n

`+` CPĐ : S + wasn't / weren't + adj / n

`+` CNV : Was / Were + S + adj / n ?

`-` ĐT Thường :

`+` CKĐ : S + Ved / V2

`+` CPĐ : S + didn't + V

`+` CNV : Did + S + V ?

`1`.wasn't

`2`.weren't

`3`.left

`4`.was

`5`.told

`6`.didn't have 

`7`.didn't know

`8`.bought

`\text{@ TheFox}`

`1.` wasn't

`2.` weren't

`3.` left

`4.` was

`5.` told

`6.` didn't have 

`7.` didn't know

`8.` bought

`-` Cấu trúc thì QKĐ

`->` Động từ tobe

`(+)` S + was/ were + N/ adj

`(-)` S + was/ were + not + N/ adj

`(?)` Was/ were + S + N/ adj..?

`->` Động từ thường:

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

`(-)` S + didn't + Vinf + O..

`(?)` Did + S + Vinf + O..?

`-` DHNB: last, yesterday, ago, in,...