verbo en la voz pasiva
(to be) en el tiempo verbal de la voz activa
+
verbo que se conjuga en participio
presente simple
(yo como pan) I eat bread - bread is eaten by me (el pan es comido por mí)
presente continuo
I am eating bread - bread is being eaten by me
futuro simple
I will eat bread - bread will be eaten by me
pasado simple
I ate bread - bread was eaten by me
presente perfecto
I have eaten bread - bread has been eaten by me