Passive Voice 1

Put the sentences in the Passive Voice.
The dog ate the sandwich.The sandwich was eaten by the dog.
My friend is painting the walls.The walls are being painted by my friend.
Kate doesn't collect stamps.Stamps aren't collected by Kate.
Mike has made the chairs.The chairs have been made by Mike.
I am reading the book.The book is being read by me.
Did Ben invite you?Were you invited by Ben?
Somebody buys bread every day.Bread is bought every day.
They will water the trees tomorrow.The trees will be watered tomorrow.
They build houses every year.Houses are built every year.
They didn't find the watch.The watch wasn't found.
Has anybody brought the flowers?Have the flowers been brought?