1. Our written work was returned to us by the teacher 

→ Câu bị động quá khứ đơn: S + was / were + V3/ed... + by sb/ O

___________________________________________________________________________________________________________

2. The report has been finished by her

3. Five suspects have been arrested by the police

→ Câu bị động hiện tại hoàn thành: S + have/ has + been + V3/ed... + by sb/ O

Cấu trúc câu chủ động :

$ S_1 + V + S_2$ ( $S_2$ là tân ngữ )

Chuyển sang câu bị động :

$ S_2 + tobe + V_{pII} + by\  S_1$ ($S_1$ chuyển sang dạng tân ngữ )

1. Our written work was returned to us by the teacher

2. The report has been finished by her

3. Five suspects have been arrested by the police