`1.` wasn't

`=>` yesterday là `DHNB` thì `QKĐ`

`=>` Cấu trúc: S + be ( was/were ) + ( not ) + adj + O

`=>` I là chủ từ số ít `->` Dùng wasn't

`2.` weren't 

`=>` yesterday là `DHNB` thì `QKĐ`

`=>` Cấu trúc: S + be ( was/were ) + ( not ) + adj + O

`=>` The people in the café là chủ từ số nhiều `->` Dùng weren't

`3.` left

`=>` this morning là `DHNB` thì `QKĐ`

`=>` Cấu trúc: S + V2/-ed + O

`4.` was

`=>` in `2001` là `DHNB` thì `QKĐ`

`=>` Cấu trúc: S + be ( was/were ) + adj + O

`=>` It là chủ từ số nhiều `->` Dùng was

`5.` told

`=>` yesterday là `DHNB` thì `QKĐ`

`=>` Cấu trúc: S + V2/-ed + O

`6.` didn't have

`=>` Vế trước có went là `DHNB` thì `QKDD` 

`=>` Cấu trúc: S + didn't + Vo ( động từ nguyên mẫu ) + O

`7.` didn't know

`=>` Vế sau có did là `DHNB` thì `QKĐ`

=>` Cấu trúc: S + didn't + Vo ( động từ nguyên mẫu ) + O

`8.` bought

`=>` yesterday là `DHNB` thì `QKĐ`

`=>` Cấu trúc: S + V2/-ed + O

1. I wasn't very happy yesterday

2. The people in the café  weren't friendly when I was there yesterday

3. I   leaved my school bag at school this morning

4. It  was a great film in 2001

5. Our teacher told us to be quiet yesterday

6. I went to the shop but I  didn't have any money

7. Susan  didn't know about the exam and she did very badly

8. I  bought a ticket for the football match yesterday