PASSIVE VOICE: PRESENT SIMPLE, PAST SIMPLE, PRESENT PERFECT SIMPLE.

THE PASSIVE 
Passive sentence describe what happends to people or things ofteb as a result of action by other people or things. 
Passive sentence often indicate that what happens is more important that who is responsible. 
EXAMPLE 

Active 
Simon has painted the house.
The speakers is talking about Simon and the house. 

Passive 
The house has been painted. 
Only the house is being discussed and not the person who painted it. 

Form: 

Present      noun/pronoun   +    is/ are  +     past participle
                      The cars                are             taken abroud 

Past            noun/ pronoun  +   was/were  +  past participle 
                       The cars                were           taken abroud 

Present      noun/pronoun   +  has/ have been  +  past  participle                         The cars            have been         taken abroud 
 perfect  

The rules for choice of  tense are the same in the passive as they are for active sentences.

Example 
1) We clean the garages every day.
    The garages are cleaned every day. 
2) Someone has given him a lot money. 
    He has been given a lot of money 
3) The pólice arrested two hundred people. 
    two hundred has been people were arrested