Passive Voice

1. When rewriting active sentences in passive voice, note the following:
-The object of the active sentence becomes the subject of the passive sentence
-The finite form of the verb is changed (to be + past participle)
-The subject of the active sentence becomes by Agent in the passive sentence (or is dropped)
-Only active sentence containing object which can be changed into passive form
The two forms should have the same tenses

2. Agent
In a passive clause, we usually use a phrase beginning with by if we want to mention the agent - the person / thing that does the action, or that causes what happens.
EXAMPLES:
MY MOTHER MAKES THE BURGER EVERY MORNING.
SUBJECT VERB1+S/ES O C (ADV. OF TIME)

THE BURGER IS MADE BY MY MOTHER EVERY MORNING.
SUBJECT O BE+V3 AGENT C (ADV. OF TIME)

WHAT ABOUT OTHER TENSES?
PRESENT CONTINUOUS : [ S + TO BE + BEING +V3 (PAST PARTICIPLE)
PRESENT PERFECT: [ S + HAS/HAVE + BEEN + V3 (PAST PARTICIPLE)

Here are the examples:
A young boy is catching a butterfly.
A butterfly is being caught by a young boy.
Yano has returned the book to the library.
The book has been returned to the library by Yano.

Next,
If you want to change an active sentence which has two objects into its passive forms, there are two ways:
Make its indirect object into the subject of the passive sentence.
Make its direct object into the subject of the passive sentence

FOR INSTANCE:
John is giving his girl-friend a bunch of flower.
indirect object direct object
Passive: The indirect object as the subject
John’s girl-friend is being given a bunch of flower

or

Passive: The direct object as the subject
A bunch of flower is being given to John’s girl-friend

how about the negative and interrogative?
Take a look at the followings:
People don’t use bikes anymore
Bikes are not used anymore

Did the students play the cards in the class yesterday?
Were the cards played in the class yesterday?

SOME EXAMPLES (SIMPLE PRESENT, PAST AND FUTURE)
Some students open the book silently during the examination (active)
The books are opened silently by some students during the examination. (passive)

Ku Klux Klan killed many innocent people.
Many innocent people were killed by Ku Klux Klan

> Sting will perform the 2nd world tour in Indonesia
> The 2nd world tour will be performed by Sting in Indonesia