`\text{1. }`

(-) Betty wasn't in bed.

(?) Was Betty in bed?

`\text{2. }`

(-) They weren't sad last night.

(?) Were they sad last night?

`\text{3. }`

(-) Mary and John weren't at the zoo yesterday.

(?) Were Mary ađ John at the zoo yesterday?

`\text{4. }`

(-) John wasn't lucky

(?) Was John lucky?

`\text{- Cấu trúc Quá khứ đơn với động từ tobe}`

(-) S+ was/were+ O/N...

(?) Was/were+ S+ O/N?

+ I/we/they/you/Danh từ số nhiều+ was

+ He/she/ it/ Danh từ số ít+ were

Cấu trúc thì quá khứ đơn tobe :

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

`- ` Chủ ngữ là I / he / she / it + was + ...

` - `Chủ ngữ là You / we / they + were + ...

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

`- ` Chủ ngữ là I / he / she / it + was + not +  ...

` - `Chủ ngữ là You / we / they + were + not + ...

` ( ? ) ` : Was / Were + S + ... ? 

` - ` Was + He / she / it + ... ?

` -` Were + you / we / they + ... ? 

` - ` Was not ` =` Wasn't , Were not ` = ` Weren't

` 2 `  : `  ( - ) `  : Betty wasn't in bed

` ( ? ) `  : Was Betty in bed ?

` 3 `  : `  ( - ) `  They weren't sad last night

` ( ? ) `  : Were they sad last night ?

` 4 `  : `  (- ) `  : Mary and Jonh weren't at the zoo yesterday

` ( ? ) ` : Were Mary and Jonh at the zoo yesterday ?

` 5 `  : `  ( - ) `  Jonh wasn't lucky

` ( ? ) `  : Was Jonh lucky ?