`3.`

`(+)` They built a new house

`(-)` They didn’t build a new house

`(?)` Did they build a new house?

`4.`

`(+)` I was at the concert last Sunday

`(-)` I wasn’t at the concert last Sunday

`(?)` Was you at the concert last Sunday?

`5.`

`(+)` I bought clothes in this little shop

`(-)` I didn't buy clothes in this little shop

`(?)` Did you buy clothes in this little shop?

`------`

Công thứ thì quá khứ đơn

`@` Với tobe

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

`(-)` S + tobe(wasn't/weren't) + O

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

`@` Với động từ

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

`(-)` S + didn't + Vbare + O

`(?)` Did + S + Vbare + O?

`3.`

`(+)` They built a new house.

`(-)` They didn’t build a new house.

`(?)` Did they build a new house?

`4.` 

`(+)` I was at the concert last Sunday.

`(-)` I wasn’t at the concert last Sunday.

`(?)` Was you at the concert last Sunday?

`5.`

`(+)` I bought clothes in this little shop.

`(-)` I didn't buy clothes in this little shop.

`(?)` Did you buy clothes in this little shop?

Cấu trúc thì QKĐ:

`-` Động từ thường:

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

`(-)` S + didn't/ did not + V1 + O

`(?)` Did + S + V1..?

`->` Yes, S + did

`->` No, S + didn't

`-` Động từ tobe:

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

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

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

`->` Yes, S + was/ were

`->` No, S + was/ were + not

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

`-` Chủ ngữ là số ít `->` was

`-` Chủ ngữ là số nhiều, ngôi thứ nhất/ thứ 2 `->` were

`-` was not = wasn't

`-` were not = weren't

@_Khahn.Lihz02_