`+` Công thức tobe:

`-` "Was" thường đi với chủ ngữ: I/ It/ she / he/ N(danh từ số ít)

`-` "Were" thường đi với chủ ngữ: They/ You/we/ N(danh từ số nhiều)

`+` Cấu trúc thì Quá khứ đơn:

`(+)` Khẳng định: S + Ved/V2

`(-)` Phủ định: S + didn't + V(động từ nguyên mẫu)

`(?)` Nghi Vấn: Did + S + V(Động từ nguyên mẫu)...?

`*` Dấu hiệu nhận biết"

`-` yesterday

`-` ago, last (week, year, month)

`-` in the past

`-` in the last......

Đáp án:

Bài `1` :

`1.` was            `2.` were           `3.` wasn't 

`4.` was             `5.` weren't        `6.` wasn't

`7.` were            `8.` wasn't         `9.` wasn't  

`10.` weren't

Bài `2` :

`2.` `(-)` She wasn't born in 1993.

      `(?)` Was she born in 1993?

`3.` `(-)` They weren't busy last week.

      `(?)` Were they busy last week?

`4.` `(-)` She didn't go to New York last year.

      `(?)` Did she go to New York last year?

`5.` `(-)` I didn't have dinner at a restaurant yesterday.

      `(?)` Did you have dinner at a restaurant yesterday ?

`6.` `(-)` Ernie didn't eat a doughnut.

      `(?)` Did Ernie eat a doughnut ?

`7.` `(+)` They were in Rio last summer.

      `(-)` Were they in Rio last summer?

`8.` `(-)` I didn't do your homework this morning.

      `(+)` I did your homework this morning.

`9.` `(-)` the hotel wasn't very expensive.

      `(?)` Was the hotel eat a doughnut?

`10.` `(+)` The children did to the zoo yesterday.

        `(-)` Did the children go to the zoo yesterday?