Ex 1: Mai's dog is fed twice a day by Mai.

Ex 2: This tree was grown by my father yesterday.

`-` grow - grew - gown: trồng

`-` Dấu hiệu: yesterday `->` Thì quá khứ đơn

Ex 3: Car is washed by my father every day.

`-` Dấu hiệu: every day `->` Thì hiện tại đơn

Ex 4: Their parents were visited (by them) last week.

`-` Dấu hiệu: last week `->` Thì quá khứ đơn

Ex 5: English isn't spoken in here (by people).

`-` speak - spoke - spoken: nói

Ex 6: Vegetables aren't grown here by farmers.

Ex 7: This house wasn't built (by them) 2 years ago.

`-` Dấu hiệu: ago `->` Thì quá khứ đơn

`-` build - built - built: xây

Ex 8: My mother's hair was not washed (by her) yesterday.

`-` Dấu hiệu: yesterday `->` Thì quá khứ đơn

Ex 9: These dogs are not fed by Mrs Lien every day.

`-` Dấu hiệu: every day `->` Thì hiện tại đơn

Ex 10: Soccer isn't played in this area (by people)

Ex 11: Was Nam panished by the teacher yesterday?

`-` Dấu hiệu: yesterday `->` Thì quá khứ đơn

Ex 12: Is Hoa's room cleaned by her everyday?

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Bị động của:

`-` Thì hiện tại đơn:

$(+)$ S + am/is/are + V(pp) + (by O)

$(-)$ S + am/is/are + not + V(pp) + (by O)

$(?)$ Am/Is/Are + S + V(pp) + (by O)?

`-` Thì quá khứ đơn:

$(+)$ S + was/were + V(pp) + (by O)

$(-)$ S + was/were + not + V(pp) + (by O)

$(?)$ Was/Were + S + V(pp) + (by O)?

`-` by O đứng trước trạng từ chỉ thời gian

`-` by O đứng dau trạng từ chỉ nơi chốn