The document discusses the passive voice in English grammar. The passive voice is formed using a form of the verb "to be" along with the past participle of the main verb. It is used when the actor or subject is unknown or unimportant. The document provides examples of the different tenses and forms of the passive voice, as well as how to transform sentences from the active to passive voice by making the direct object the subject and using "to be" plus the past participle.

1. THE PASSIVE VOICE:
We use the passive voice when we want note to the action or when we
don't know who has carried up the action.
The passive voice is make up with the auxiliary verb “to be” and the past
participle.
Subject + Auxiliary verb “to be” + Past Participle.
Example: All of the cookies were eaten
.

2. FORM OF THE PASSIVE VOICE:
Present simple: Is/am/are + past participle
Ex: The lesson IS STUDIED by my brother.
Past simple: Was/were + past participle
Ex: The lesson WAS STUDIED by my brother
Present perfect: Has/have been + past participle
Ex: The lesson HAS BEEN STUDIED by my brother
Present continuous: Is/am/are being + past participle
Ex: The lesson IS BEING STUDIED by my brother
Past continuous: Was/were being+ past participle
Ex: The lesson WAS BEING STUDIED by my brother
Future simple: Will be + past participle
Ex: The lesson WILL BE STUDIED by my brother.
Modals verbs: Must/can/should + present/past/future + past participle
Ex: The lesson SHOULD BE STUDIED by my brother.

3. Active to Passive transformation:
The ball was kicked by Alice
* The direct object of the active sentence becomes the grammatical subject
of the passive sentence.
* The verb is replaced by a form of be that corresponds in tense and aspect
to the form in the original sentence, and the verb stem becomes the past
participle.
kicked (= past + kick) becomes was kicked (= past + be +en + kick)
* The subject of the active sentence becomes the object of the preposition
by in an adverbial agent phrase.
Active: Mary (subject) painted (principal verb) the room (object)
Passive: The room (object) was painted (be + past participle) by mary
(subject)

4. EXAMPLES ACTIVE TO PASSIVE TRANSFORMATION:
One a week, Tom cleans the house
Once a week, the house is cleaned by Tom.
Right now, Sarah is written the letter
Right now, the letter is being written by Sarah
Sam repaired the car
The car was repaired by Sam
Many tourists have visited that castle
That Castle has been visited by many turists.
Someone will finish the work by 5:00 PM.
The work will be finish by 5:00 PM.