`12.` All the workers of the plan were being instructed by the chief enginner.

`-` Bị động QKTD : S + was/were + being + V-ed/c3 + ... + (by+O)

`13.` Tea can't be made with cold water.

`-` Bị động modal verb : S + can + be + V-ed/c3 + ... + (by+O)

`14.` Some of my books have been taken away.

`15.` The meeting will be held before May Day.

`-` Bị động modal verb : S + will + be + V-ed/c3 + ... + (by+O)

`16.` The engine of the car has to be repaired.

`-` Bị động modal verb : S + have/has + to + be V-ed/c3 + ... + (by+O)

`Answer:`

`12,` All the workers of the plan were being instructed by the chief engineer

`13,` Tea cannot be made with cold water

`14,` Some of my books have been taken away

`15,` The meeting will be held before MayDay

`16,` The engine of the car has to be repaired

________________________________________

$\text{*Structure:}$

`@` Câu bị động thì QKTD:

`+)` $\text{S + was/were + being + VpII + by O...}$

`-)`  $\text{S + was/were + not + being + VpII + by O...}$

`?)` $\text{Was/Were + (not) + S + being + VpII + by O...}$

`@` Câu bị động thì TLĐ:

`+)` $\text{S + will/shall + be + VpII + by O...}$

`-)` $\text{S + will/shall + not + be + VpII + by O...}$

`?)` $\text{Will/Shall + (not) + S + be + VpII + by O...}$

`@` Câu bị động thì HTHT:

`+)` $\text{S + have/has + been + VpII + by O...}$

`-)` $\text{S + have/has + not + been + VpII + by O...}$

`?)` $\text{Have/Has + (not) + S + been + VpII + by O...}$

`@` Câu bị động với ĐTKT:

`+)` $\text{S + ĐTKT + be + VpII + by O...}$

`-)` $\text{S + ĐTKT + not + be + VpII + by O...}$

`?)` $\text{ĐTKT + (not) + S + be + VpII + by O...}$

`#TD`