`1.` Money is collected by John.

`2.` The window was opened by Anna.

`3.` A lot was eaten by the sheep.

`4.` Our rooms are not cleaned.

`5.` Was this circle drawn by Sue?

`6.` English is taught by him.

`7.` The servant was punished by the master.

`8.` Meal is cooked everyday.

`9.` A blue shirt was worn by him.

`10.` The report was sent yesterday.

`11.` A diamond necklace was bought by her.

`12.` Radio waves were discovered by Heinrich Hertz.

*Cấu trúc câu bị động (Hiện tại đơn):

`(+)` S + am/is/are + V3(ed/BQT) + (by O).

`(-)` S + am/is/are + not + V3(ed/BQT) + (by O).

`(?)` Am/Is/Are + S + V3(ed/BQT) + (by O)?

*Cấu trúc câu bị động (quá khứ đơn):

`(+)` S + was/were + V3(ed/BQT) + (by O).

`(-)` S + was/were + not + V3(ed/BQT) + (by O).

`(?)` Was/Were + S + V3(ed/BQT) + (by O)?

Đáp án: (chữ in đậm)

`1.` `-` Chia ở thì HTĐ bị động

`+` Dựa vào cấu trúc: S + am/is/are + PII + (by  o)

`-` Mà tân ngữ "money" là số ít

`=>` Moeny is collected by John.

`2.` `-` Chia ở thì QKĐ bị động

`+` Dựa vào cấu trúc: S + was/were + PII + (by  o)

`=>` The window was opened by Anna.

`3.` A lot was eaten by the sheep. (tương tự câu 2)

`4.` Our rooms  aren't cleaned (by  we). (tương tự câu 1)

`5.` Was this circle drawn by Sue?

`-` Cấu trúc: Was/were + S + PII + (by  o)...?

`6.` English is taught by him. (tương tự câu 1)

`7.` The servant was punished by the master. (tương tự câu 2)

`8.`  `-` Câu này chia ở thì HTĐ vì có "every day"

`+` Dựa vào cấu trúc: S + am/is/are + PII + (by  o)

`=>` Meal is cooked(by somebody) every day.

`9.` A blue shirt was worn by him. (tương tự câu 2)

`10.` The report was sent by me yesterday. (tương tự câu 2)

`11.` A diamond necklace was bought by her. (tương tự câu 2)

`12.` `-` Câu này chia ở thì QKĐ 

`+` Dựa vào cấu trúc: S + was/were + PII + (by  o)

`-` Mà tân ngữ "Radio waves" là số nhiều 

`=>` Radio waves were discovered by Heinrich Hertz.