People throw away billions of cans every year all over the world.
=> Billions of cans are thrown away every year all over the world.

They collect the glass and send it to the factory.
=> The glass is collected and sent to the factory.

Who usually writes the letters?
=> By whom are the letters usually written?

Will they open the new hotel next year?
=> Will the new hotel be opened next year?

Nam often borrows books from his school library.
=> Books are often borrowed from Nam's school library by Nam.

My classmate, Minh, plays football very well.
=> Football is played very well by my classmate, Minh.

He doesn't finish his exercises on time.
=> His exercises aren't finished on time by him.

My sister will hold a party next Sunday.
=> A party will be held next Sunday by my sister.

I won't give him this book.
=> He won't be given this book by me.

Somebody cleans the room every day.
=> The room is cleaned every day.