`-` BĐ :

`+` QKĐ : S + was / were + VpII ( by O )

`+` TLĐ : S + will be + VpII ( by O )

`+` TLG : S + is / am / are + going to be + VpII ( by O )

`+` Must : S + must be + VpII ( by O )

`1`.All the rules of transportation must be obeyed when you are driving

`2`.I am going to be bought a new bike by my dad

`3`.I will be helped with making cakes by Lan

`4`.Lan's younger sister is going to be helped do homework

`5`.All flights were cancelled because of fog

`\text{# TF}`

` 1 . ` All the rules of transportation must be obeyed when you are driving

- Bị động với động từ khiếm khuyết must : S + must + ( not ) + be + V3 + ( by O ) 

` 2 . `  I am going to be bought a new bike by my dad

- Bị động thì tương lai gần : S + is / am / are + ( not ) + going to be + V3 + ( by O ) 

` 3 . ` I will be helped with making cakes by Lan 

- Bị động thì tương lai đơn : S + will + ( not ) + be + V3 + ( by O ) 

` 4 . ` Lan's younger sister is going to be helped do homework by Lan 

` 5 . ` All flights were cancelled because of fog 

- Bị động thì quá khứ đơn : S + was / were + ( not ) + V3 + ( by O )