Pasiva = be (en el tiempo de la activa) + participio; agente con by solo si importa.
Tiempos
- is done · is being done · was done · was being done
- has been done · had been done · will be done
- must be done · should have been done
Estructuras especiales
- Dos objetos: She was given a present.
- It is said / thought / believed that + oración.
- Sujeto + is said to + infinitivo / to have + participio / to be + -ing.
Errores frecuentes
- Olvidar el participio: «was build» ✗ → was built.
- Olvidar being en los continuos: «is repaired now» ✗ → is being repaired.
- Verbos intransitivos (happen, arrive, die) no tienen pasiva.