$1. $ This flower is watered (by my father) every morning

$→$ Câu bị động thì HTĐ : S + am/is/are + V3 (+ by Sb/ O)

$→$ Dấu hiệu : every morning

$2. $ Fiona was invented to John's birthday party last night

$→$ Câu bị động thì QKĐ : S + was/ were + V3 (+ by Sb/ O)

$→$ Dấu hiệu : last night

$3. $ The dinner is being prepared (by her mother) in the kitchen

$→$ Câu bị động thì HTTD : S + am/ is/ are +  being + V3 (+ by Sb/ O)

$4. $ Our teeth should be cleaned twice a day

$→$ Câu bị động với ĐTKT : S + ĐTKT + be + V3 (+ by O)

$5. $ The English grammar has been explained (by our teacher)

$→$ Câu bị động thì HTHT : S + have/ has + been + V3 (+ by Sb/ O)

$6. $ The accident was caused in this city (by some drunk drivers)

$→$ Câu bị động thì QKĐ : S + was/ were + V3 (+ by Sb/ O)

`@Chamian`

chuyển sang câu bị động

1.  This flower is watered by my father every morning

-> Bị động thì HTD: S +is/am/are + Vpp + O

2. Fiona was invited to John's birthday party last night

-> Bị động Thì QKD: S +was/were + Vpp + O

3. The dinner is being prepared in the kitchen by her mother

-> Bị động Thì HTTD: A + is/am/are being + Vpp + O

4. Our teeth should be cleaned twice a day

-> should be Vpp: nên được làm gì

5. The english grammar has been explained by our teachers

-> Bị động Thì HTHT: S + has/have been + Vpp + O

6. The accident was caused by some drunk drivers in this city

-> Bị động Thì QKD: S +was/were + Vpp + O