`1` Rice is grown in those fields

`=>` Bị động - hiện tại đơn

`+` S + is/am/are + PII (by......)

`2` I will be met by John at the airport

`=>` Bị động - tương lai đơn

`+` S + will be + PII (by.........)

`3` English is spoken all over the world

`=>` Cấu trúc câu `1`

`4` I was kept waiting for half an hour

`5` He was found by the police in the forest

`=>` Bị động - quá khứ đơn

`+` S + was/were + PII (by.......)

`6` A car will be bought by my brother tomorrow

`=>` Cấu trúc câu `2`

$\text{1.}$Rice is grown in those fields . 

$\text{2.}$ I will be met at the airport by John tomorrow .

$\text{3.}$ English is spoken all over the world . 

$\text{4.}$I was kept waiting for half an hour . 

$\text{5.}$ He was found by the police in the forest .

$\text{6.}$ A car will be bought by my brother tomorrow . 

$\text{-> Câu bị động thì Hiện Tại Đơn : S+is/am/are+Vpp + ( by O ) }$

$\text{-> Câu bị động thì Quá Khứ Đơn : S+was/were + Vpp + ( by O ) }$

$\text{-> Câu bị động thì Tương Lai Đơn : S+will be + Vpp + ( by O ) }$