Understanding voice is helpful in mastering proper grammar and other essential grammar concepts. This page will quickly give you a foundation in voice. The active voice is that form of the verb which shows the Subject not being acted upon but acting.
Definition
The active voice is that form of the verb which shows the
Subject not being acted upon but acting; as, "The cat
catches mice." "Charity covers a multitude of
sins."
The passive voice: When the action signified by a
transitive verb is thrown back upon the agent, that is to say, when
the subject of the verb denotes the recipient of the action, the
verb is said to be in the passive voice. "John was loved by his
neighbors." Here John the subject is also the object affected by
the loving, the action of the verb is thrown back on him, hence the
compound verb was loved is said to be in the passive
voice. The passive voice is formed by putting the perfect
participle of any transitive verb with any of the eleven
parts of the verb To Be.