`7.` `(-)` My parents don't live in the countryside.
`(?)` Do yor parents live in the countryside?
`8.` `(-)` Tom didn't give me any American stamps five days ago.
`(?)` Did you give you any American stamps five days ago?
`9.` `(-)` Mrs Oanh isn't our new literature teacher.
`(?)` Is Mrs Oanh your new literature teacher?
`10.` `(-)` There wasn't a toy store next to the museum.
`(?)` Was there a toy store next to the museum?
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`+` Cấu trúc thì Quá khứ đơn:
`(+)` S + Ved/V2
`(-)` S + didn't + V_inf
`(?)` Did + S + V_inf...?
`+` Thì Hiện tại đơn:
`(+)` S + Vs/es
`(-)` S + do/does + not + V_inf
`(?)` Does/Do + S + V_inf...?
`+` Cấu trúc thì Quá khứ đơn với tobe:
`(+)` S + was/were +....
`(-)` S + was/were + not +....
`(?)` Was/were + S + V_inf...?
