They should call their parents more often.
Their parents should be called more often.
She didn’t like the food at that restaurant.
The food at that restaurant wasn’t liked by her.
I usually visit my grandparents after work.
My grandparents are visited after work by me.
She will start her new job next month.
Her new job will be started next month.
You should drink more water every day.
More water should be drunk every day.
They studied hard and passed all their exams.
All their exams were passed after hard studying.
I watched a really good film yesterday.
A really good film was watched by me yesterday.
I might attend to the concert if I finish my homework.
The concert might be attended by me if I finish my homework.
Don’t worry — everything will be fine.
You can't use passive voice with this one!
The rain destroyed the roof.
The roof was destroyed by the rain.
We use the bus to travel to school.
The bus is used to travel to school by us.
We will visit Paris in the summer holidays.
Paris will be visited in the summer holidays.
We visited our grandparents last weekend.
Our grandparents were visited last weekend.
I will help you with your project tomorrow.
You will be helped with your project tomorrow.
They will probably buy this new car.
The new car will probably be bought by them.
They don’t eat meat, but they love fish.
Meat isn’t eaten by them, but fish is loved.
She might not do the homework.
The homework might not be done by her.
She plays the guitar very well.
The guitar is played very well by her.
My brother works in a big company in London.
A big company in London is worked in by my brother.
He must wear a helmet when he rides his bike.
A helmet must be worn when he rides his bike.