La voz

Voice, one of the five inflections involved in conjugating Spanish verbs, indicates the relationship between the subject and verb. There are four voices in Spanish:

Active voice

The subject performs the action of the verb. This is the most common, "normal" voice.

Lavo la ropa.   I wash the clothes.
Rompió la taza.   He broke the cup.
Es profesor de español   He’s a Spanish teacher.

Passive voice

The action of the verb is performed on the subject by an agent (less common in Spanish).

La ropa es lavada.   The clothes are washed.
La taza fue rota por el perro.   The cup was broken by the dog.
El carro fue vendido.   The car was sold.

Pronominal (reflexive)

The subject performs the action on itself (considerably less common in English).

Me lavo.   I’m washing (myself).
Se rompió la pierna.   He broke his leg.
Quiero mirarme en el espejo.   I want to look at myself in the mirror.

Middle voice

The action of the verb occurs accidentally (does not exist in English).

Se me olvidó el libro.   I forgot the book.
¿Se te perdióron las llaves?   Did you lose the keys?
Sí, se me cayeron ayer.   Yes, I dropped them yesterday.