Grammatical voice

Grammatical voice

In grammar, the voice (also called gender or diathesis) of a verb describes the relationship between the action (or state) that the verb expresses and the participants identified by its arguments (subject, object, etc.). When the subject is the agent or actor of the verb, the verb is in the active voice. When the subject is the patient, target or undergoer of the action, it is said to be in the passive voice.

The passive voice in English
The English language uses a periphrastic passive voice; that is, it is not a single word form, but rather a construction making use of other word forms. Specifically, it is made up of a form of the auxiliary verb to be and a past participle of the main verb. [http://en.wikipedia.org/wiki/Grammatical_voice]