Thì QKĐ `:`

`-` ĐT Tobe : 

`+` CKĐ : `\text{S + was / were + adj / n }`

`+` CPĐ : `\text{S + wasn't / weren't + adj / n}`

`+` CNV : `\text{Was / Were + S + adj / n ?}`

`-` ĐT Thường :

`+` CKĐ : `\text{S + Ved` / V2}`

`+` CPĐ : `\text{S + didn't + V}`

`+` CNV : `\text{Did + S + V ?}`

`4`.

`( - )` He didn't work as an accountant from 1995 to 2000

`( ? )` Did he work as an accountant from 1995 to 2000 ?

`5`.

`( - )` Jim and Claire weren't tired of doing the same thing in the office yesterday

`( ? )` Were Jim and Claire tired of doing the same thing in the office yesterday ?

`\text{@ TheFox}`

Cấu trúc thì quá khứ đơn với động từ tobe

`  ( + ) `   : S + was / were + ...

`  - `   Chủ ngữ là I / he / she / it + was + ...

`  -`  Chủ ngữ là You / we / they + were + ...

`  ( - ) `   : S + was / were + not + ... 

`  - `   Chủ ngữ là I / he / she / it + was + not + ..

`  -`  Chủ ngữ là You / we / they + were +not +  ...

` ( ? ) ` : Were / Was + S + ... ?

` - ` Was + He / she / it + ... ?

`- `Were + you / we / they + ... ?

Cấu trúc thì quá khứ đơn với động từ thường

` ( + ) ` : S + v-ed / V2

` ( - ) ` : S + didn't + V nguyên mẫu

` ( ? ) ` : Did + S + V nguyên mẫu ?

` -`Các dấu hiệu nhận biết thường gặp : yesterday , last night , ` 5 ` years ago , in the past , ...

` 4 ` : He worked as an accountant from 1995 to 2000

` ( - ) ` : He didn't work as an accountant from 1995 to 2000

` ( ? ) ` : Did he work as an accountant from 1995 to 2000 ? 

` 5 `: Jim and Claire were tired of doing the same thing in the office yesterday

` ( - ) ` : Jim and Claire weren't tired of doing the same thing in the office yesterday

` ( ? ) ` : Were Jim and Claire tired of doing the same thing in the office yesterday ?