The Spanish passive with an agent

The passive puts the affected person or thing in subject position.

The idea

Use a form of ser and a past participle that agrees with the subject. Add por and the agent if needed.

La carta fue escrita por mi abuelo.The letter was written by my grandfather.
Las ventanas fueron limpiadas ayer.The windows were cleaned yesterday.
El puente será reparado por el ayuntamiento.The bridge will be repaired by the town council.
Los platos son preparados por el equipo de cocina.The dishes are prepared by the kitchen team.
La exposición fue organizada por el museo.The exhibition was organised by the museum.
Los árboles serán plantados mañana.The trees will be planted tomorrow.

Read-aloud uses a synthetic Spanish voice available on your device. Voice quality and availability vary; it does not assess your pronunciation.

Do not leave the participle masculine singular when the subject is feminine or plural.

Choose the correct form. La puerta fue ___ por el viento. (abierta / abierto)
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abierta
abierta agrees with the feminine singular door.
Choose the correct form. Los libros fueron ___ por la biblioteca. (comprados / compradas)
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comprados
comprados agrees with the masculine plural books.
Choose the correct form. La canción fue compuesta ___ una música local. (por / para)
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por
por introduces the person who composed the song.

Describe an object made by someone and another whose maker is unknown.