You need the third form of the verb to build the passive.
True
At night he ... (sleep).
sleeps
Farmers in California grow strawberries on huge farms.
Strawberries are grown on huge farms by farmers.
Chips are often eaten by me.
I often eat chips.
Strawberries is grown on huge farms.
Strawberries is grown on huge farms.
*are
You always need was/ were to build the passive.
False
The banana ... (eat) by the monkey that climbed around.
is eaten
Marlene watches Sesame Street.
Sesame Street is watched by Marlene.
Help was asked for in class by someone.
Somebody asked for help in class.
People in Canada are made by Maple Syrup.
People in Canada make Maple syrup. OR
Maple syrup is made by people in Canada.
If the record is a success, it's selled in all the record shops.
False - sold
The baby ... (cry) so loudly that the parents ... (wake up) by it.
cried * were woken up
Caja rides horses really well.
Horses are ridden very well by Caja.
Coffee was spilled on Eddie's English book.
Someone spilled coffee on Eddi's English book.
Last year, over 100 elephants was captured in the zoo.
Last year, over 100 elephants was captured in the zoo.
Last year, over 100 elephants were captured in the zoo.
Recipies are always written in the passive.
False
The hamster ... (feed) by the kids yesterday.
was fed
Caroline attended an American High School.
An American High School was attended by Caroline.
Where are most strawberries grown?
Where do you grow most strawberries?
The apple pie has made by my grandma.
The apple pie has made by my grandma.
--> was
In case there is no specific object in the passive sentence you just make up a subject in the active sentence.
False: In case there is no specific object in the passive sentence you use you/ one as a subject in the active sentence.
A man ... (pull over) by the police because he ... (seem) to be drunk.
was pulled over * seemed
They painted more than 200 pictures in Art class.
More than 200 pictures were painted in Art class.
English is spoken here.
You/One speak(s) English here.
The ship forgets for the last 100 years the inhabitants of the island.
The ship was forgotten for the last 100 years by the inhabitants of the island.