Passive – Use

We only use the passive when we are interested in the object or when we do not know who caused the action.

Example: Appointments are required in such cases.

We can only form a passive sentence from an active sentence when there is an object in the active sentence.

Form

to be + past participle

How to form a passive sentence when an active sentence is given:
– object of the “active” sentence becomes subject in the “passive” sentence
– subject of the “active” sentence becomes “object” in the “passive” sentence” (or is left out)

Active: Peter builds a house.
Passive: A house is built by Peter.

 

Examples

Active Peter builds a house. Simple Present
 
Passive: A house is built by Peter.

 

Active: Peter built a house. Simple Past
 
Passive: A house was built by Peter.

 

Active: Peter has built a house. Present Perfect
 
Passive: A house has been built by Peter.

 

Active: Peter will build a house. will-future
 
Passive: A house will be built by Peter.

 

Active: Peter can build a house. Modals
 
Passive: A house can be built by Peter.