`1.` I was happy last night.

`2.` The weather was nice yesterday.

`3.` You were late last Saturday.

`4.` He was in England in `1998.` 

`5.` Last year she was eleven years old. 

`6.` What day was it yesterday`?` 

`7.` What month was it last month`?`

`8.` We were tired after the journey but we weren't hungry. 

`@` QKĐ: 

`-` V tobe: 

`(+)` S + was/were + O

`(-)` S + was/were + not + O

`(?)` Was/Were + S + O`?`

`-` N số ít `->` Dùng was

`-` N số nhiều `->` Dùng were 

Đáp án + Giải thích các bước giải

 1. I am happy now.

`->` I was happy last night.

2. The weather is nice today.

`->` The weather was night yesterday.

3. You are late now.

`->` You were late last Saturday.

4. He is in England.

`->` He was in England in 1998.

5. She is eleven years old now.

`->` Last years, she was eleven years old.

6. What day is it today?

`->` What day was it yesterday?

7. What month is it now?

`->` What month was it last month?

8. We are tired after journey but we aren't hungry.

`->` We were tired after journey but we weren't hungry.

`-----------`

CÔNG THỨC TOBE CỦA QUÁ KHỨ ĐƠN.

`( + )` S + was/were + .....

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

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

        $\left[\begin{matrix}Yes, S + was/were\\No, S + was/were + not\end{matrix}\right.$

Was + Danh từ số ít 

Were + Danh từ số nhiều

DHNB: last + thời gian, yesterday, ....