|Simple present tenseNobody cleans the classrooms very often.||The classrooms are not cleaned very often.|
|Present continuous tenseSomebody is repairing my car.||My car is being repaired.|
|Simple past tenseThey built the Golden Gate Bridge in the 1930’s.||The Golden Gate Bridge was built in the 1930’s.|
|Past continuous tenseThe teacher gave us the homework while she was rewinding the tape.||The teacher gave us the homework while the tape was being rewound.|
|Future tense with “will”We will finish this grammar review by early October||This grammar review will be finished by early October.|
|Future tense with “going to”They are going to operate on my father tomorrow morning.||My father is going to be operated on tomorrow morning.|
|Present perfectSomebody has repaired my kitchen sink four times.||My kitchen sink has been repaired four times.|
|Past perfectThe phone company had already connected the phone when we moved in.||The telephone had already been connected when we moved in.|
|Future perfectBy the time the semester is over, the teacher will have shown all the videos.||By the time the semester is over, all the videos will have been shown.|
|Past with “used to”They used to teach blind children in special boarding schools.||Blind children used to be taught in special boarding schools.|
|Modals:You must turn in your papers on time.
|Your papers must be turned in on time.|
|Somebody can repair this clock.||This clock can be repaired.
Only a transitive verb (a verb with a direct object) can be in the passive voice.
To change a sentence from active to passive voice:
1) Move the direct object to the subject position.
2) But verb “to be” in the same verb tense as the original active voice sentence.
3) Add the past participle of the verb from the original active voice sentence.