The document discusses passive voice, including its uses, formation, examples of verb tenses in passive voice, and how to transform sentences from active to passive voice. Passive voice is formed using the auxiliary verb "to be" and the past participle of the main verb. It is used when the actor is unknown or less important than the action. To change an active sentence to passive, the object becomes the subject, the verb is changed to a form of "to be" plus the past participle, and the original subject is added as a prepositional phrase introduced with "by".

1. Passive voice

2. Uses
• We use passive voice when we don’t know
who performed the action.
• Also we use passive voice when we want
to give more importance to what
happened, that who performed the action.

3. Form of passive voice
The passive voice is formed with the
auxiliary verb “to be” and the past participle
of the verb form of the sentence in active
voice.
Subject + am/is/are + verb (past participle)

4. Examples of verb tenses
Verb tenses Active tenses Passive tenses
Present Simple Buy/buys Am/are/is bought
Past Simple Bought Was/were bought
Present Perfect Have/Has bought Have/has been bought
Past Perfect Simple Had bought Had been bought
Future with will Will buy Will be bought
Going to future Going to buy Going to be bought
Modal verbs Must/can/should buy Must/can/should be bought

5. Active to passive
transformation
The steps to transform an active sentence
to passive are:
1. The object of the active sentence becomes the
subject of the passive.
Peter writes a letter.
A letter is written by Peter.

6. Active to passive
transformation (cont.)
2. The main verb is replaced by the auxiliary verb
“to be” at his same tense, followed the main
verb in past participle tense.
Peter writes a letter.
A letter is written by Peter.

7. Active to passive
transformation (cont.)
3. The subject of the active sentence becomes
complement agent of the passive sentence. It
is preceded for the pronoun “by”.
Peter writes a letter.
A letter is written by Peter.

8. Turn Active voice into
passive voice
• John won the lottery last year. (active voice)
- The lottery was won last year by John. (passive voice)
• The boss will visit our office next week. (active voice)
- Our office will be visited next week by the boss. (passive voice)
• The police arrested the band after the robbery. (active voice)
- The band were arrested after the robbery by the police. (passive voice)
• Mary is reading a book very interesting. (active voice)
- A book very interesting is being read by Mary. (passive voice)
• He had bought a beautiful house in the beach. (active voice)
- A beautiful house had been bought in the beach by him. (passive voice)