$\text{1.}$All the workers of the plant were being instructed by the chief.

$\rightarrow$ Câu bị động Quá Khứ Đơn : S+ was/were + Vpp + ( by O ) 

$\text{2.}$Some of my book have been taken away .

$\rightarrow$ Câu bị động thì Hiện Tại Hoàn Thành : S+has/have + been + Vpp + (by O ) 

$\text{3.}$The meeting will be held before May Day. 

$\rightarrow$ Câu bị động thì Tương Lai Đơn : S+will + be+Vpp + ( by O ) 

$\text{4.}$He engine of the car has to be repaired .

$\rightarrow$ Câu bị động have to : S+has/have + to + be+Vpp + ( by O ) 

$\text{5.}$Window was broken and some pictures were taken away by the boys . 

$\rightarrow$ Câu bị động Quá Khứ Đơn : S+ was/were + Vpp + ( by O )  

$\text{1.}$Johnny told his mother he didn't know how to do that exercise . 

$\rightarrow$ S + told + sb + S + V(lùi 1 thì ) + .... 

$\rightarrow$ Hiện Tại Đơn => Quá Khứ Đơn 

$\text{2.}$My brother advised me not to comeback  before one o'clock 

$\rightarrow$  S + advised/request/ask/... + sb + (not) + to V + ....

$\text{#Chae}$

( II ).

1.

=> all the workers of the plan were being instructed by The chief engineer.

2.

=> some of my book have been taken away.

3.

=> the meeting will be held before May Day.

4.

=> The engine of the car have to be repaired.

5.

=> the window was broken and some pictures were taken away by the boys.

( III ).

1.

→ Johnny told his mother he didn't know how to do that exercise.

2.

→ My brother advised me not to come back before one o' clock.