A chocolate cake was backed by my mother
The car has been washed in the yard
The room is not _______ cleaned by my sister.
Several million visit Barcelona every year
passive voice
The house was being soiled by the dog
Barcelona is visited every year by several million
The bank was robbed by thieves
Affirmative formula Passive Voice in past continuous
The passive voice is a verbal construction in some languages by which the subject is presented as passive, while the action performed by the verb is performed by a complement and not by the active subject of the verb.
El coche ha sido lavado en el patio
Barcelona es visitada cada año por varios millones
being
Una tarta de chocolate fue horneada por mi madre
La casa estaba siendo ensuciada por el perro
El banco fue atracado por unos ladrones
Varios millones visitan Barcelona cada año
Subject + was/were + verb in past participle