Active or Passive Verbs?
“The voice of a verb indicates the strength of the subject in a sentence. It tells us whether that subject takes action or receives action. There are two possible voices: active and passive. In the active voice, the stronger form, the subject of the sentence takes the action of the verb. Our army won the battle. The subject army is strong since it takes action. This sentence uses the active voice. In the passive voice, the weaker form, the subject is acted upon. The battle was won by our army. In this sentence, the subject battle is weak because it receives the action of the army. It takes no action of its own —a battle cannot win itself — and so the sentence uses the passive voice” (Strumpf and Douglas, The Grammar Bible 38).