`-` Thì QKĐ :

`+` PĐ : S + wasn't / weren't + adj / n

`+` NV : Was / Were + S + adj / n ?

`=>` `DHNB` : ago , last , yesterday , ...

`1`.

`( - )` The teacher wasn't nice

`( ? )` Was the teacher nice ?

`2`.

`( - )` The students weren't very clever

`( ? )` Were the students very clever ?

`3`.

`( - )` Our student wasn't in trouble

`( ? )` Was our student in trouble ?

`4`.

`( - )` We weren't sorry for him

`( ? )` Were you sorry for him ?

`5`.

`( - )` He wasn't nice though

`( ? )` Was he nice though ?

`6`.

`( - )` I wasn't happy

`( ? )` Were you happy ?

`7`.

`( - )` You weren't angry

`( ? )` Were you angry ?

`8`.

`( - )` She wasn't in London last week

`( ? )` Was she in London last week ?

`\text{# TF}`

`1. ( - )` The teacher wasn't nice. 

`( ? )` Was the teacher nice?

`2. ( - )` The students weren't very clever

`( ? )` Were the students very clever?

`3. ( - )` One student wasn't in trouble.

`( ? )` Was one student in trouble?

`4. ( - )` We weren't sorry for him.

`( ? )` Were you sorry for him?

`5. ( - )` He wasn't nice though. 

`( ? )` Was he nice though?

`6. ( - )` I wasn't happy.

`( ? )` Was you happy?

`7. ( - )` You weren't angry.

`( ? )` Were you angry?

`8. ( - )` She wasn't in London last week.

`( ? )` Was she in London last week? 

`-` Thì QKD - Dấu hiệu: in the past, last + time (week/month/year/...),...

`-` Với tobe

`( + )` S (số ít + I, he,she,it) + was + N/adj/... + O

S (số nhiều + you, we, they) + were + N/adj;... + O

`( - )` S (số ít + I, he,she,it) + wasn't + N/adj/... + O

S (số nhiều + you, we, they) + weren't + N/adj;... + O

`( ? )` Was + S (số ít + I, he,she,it) + N/adj/... + O?

Were + S (số nhiều + you, we, they) + N/adj/... + O?