Active or Passive

The plays were written by Shakespeare

Teachers always eat the homework

Teachers use their snot for glue

The email was answered by the rhino

The teacher's coat was stapled to the wall by the naughty puppy

The sparrow stole the ruler from the teacher's desk

The cupcakes were decorated by the duck

The tractor was driven by the toucan

The cat answered the telephone for the human

ACTIVE = subject, was/were, verb, by, subject?