Transform
Amy mailed the package.
The package was mailed by Amy.
The car was repaired by Sam.
Sam repaired the car.
An active voice sentence can be transformed to passive voice only if there is an object.
Correct.
kiss
My friend was kissed by her favorite artist
We were invited by our neighbors to attend their party.
Passive.
Once a week, John cleans the garage.
Once a week, the garage is cleaned by John.
The lightbulb was invented by Thomas Alba Edison.
Thomas Alba Edison invented the lightbulb.
The formula for the passive voice is:
S + V be in past particple + V. ing + C
Incorrect - THE FORMULA IS:
S + V BE IN ANY TENSE + V IN PAST PARTICIPLE + C
accept
Susy's request was accepted by a committee.
The painting was sold to someone who later donated it to the college.
Passive.
Adam finished the project last night.
The project was finished by Adam last night.
A delicious dinner is made by Sally every day.
Sally makes a delicious dinner every day.
You can omit the by phrase when the agent is understood, obvious or unknown.
Correct
eat
Ceviche is eaten in different cities.
Peter builds houses in the summer.
Active.
A famous artist painted murals around the city.
Murals were painted around the city by a famous artist.
The dress was designed by Zarah.
Zarah designed the dress.
The passive voice can be in simple present, simple past and other tenses.
Correct
drive
The city buses are driven by experienced drivers.
My cellphone was stolen in the supermarket.
Passive
Our History teacher reads one hundred papers every day.
One hundred papers are read by our History teacher.
The exams are marked by a qualified instructor.
.A qualified instructor marks the exams.
The old man was excited. - This sentences is in passive voice.
Incorrect - This sentence is in active voice: excited is an adjective.
see
A UFO was seen yesterday in the horizon.
The cat caught a tiny mouse and played with it.
Active