|TENSE/VERB FORM||ACTIVE VOICE||PASSIVE VOICE|
|Simple present||keeps||is kept|
|Present continuous||is keeping||is being kept|
|Simple past||kept||was kept|
|Past continuous||was keeping||was being kept|
|Present perfect||has/have kept||has/have been kept|
|Past perfect||had kept||had been kept|
|Future||will keep||will be kept|
|Conditional||would keep||would be kept|
|Perfect conditional||would have kept||would have been kept|
|Present infinitive||to keep||to be kept|
|Perfect infinitive||to have kept||to have been kept|
|Present participle/ gerund Perfect participle||keeping / having kept||being kept / having been kept|
MAIN USES OF THE PASSIVE VOICE
a) When the person doing the action (the agent) is not known, or when it is unnecessary to mention the agent. For example:
MY CAR’S BEEN STOLEN! MILK IS OFTEN SOLD IN CARTONS.
b) To emphasisethe action or event rather than the agent. For example:
LETTERS ARE COLLECTED FROM THE BOXES, TAKEN TO THE SORTING OFFICE, SORTED
AND THEN SENT TO THE CORRECT PART OF THE COUNTRY.
c) To avoid using you and onewhen making an impersonal statement. For example:
TAKING PHOTOGRAPHS IN THE MUSEUM IS FORBIDDEN.
CHILDREN ARE NOT ALLOWED IN THE BAR.
d)VERBS WITH TWO OBJECTS
GIVE SEND SHOW LEND PAY PROMISE REFUSE TELL OFFER
These verbs are followed by two objects, which usually refer to a person and a thing.
She gave her sister the car.
Her sister was given the car. The car was given to her sister.
*Most often in such cases the person becomes the subject of the passive verb.