Прошу помощь. Незнаю как делать.

The post is delivered by them every day
Seeds are eaten by birds
Three houses on the neighborhood were destroyed by a storm
The school was built by them in 1956
Is the dinner cooked by her every night?
Were the dishes washed by Nicky?
Johnny's bag wasn't stolen by Ben
The missing painting was found by them
The dog is taken for a walk by Fiona every day.