The true passive voice in Spanish is formed with ser plus a past participle. It works much like the English passive ("was written", "is built"), but with one crucial difference: the participle behaves like an adjective and must agree in gender and number with the grammatical subject.
This structure is far less common in everyday Spanish than in English. Spanish speakers usually prefer the active voice or the passive se, reserving ser + participle mostly for formal writing, news reports, and situations where the agent is important.
Basic formula
The formula is simple:
subject + ser (conjugated) + past participle (agreeing)
The tense of ser determines the tense of the passive clause. The participle always ends in -o / -a / -os / -as depending on the subject.
Las cartas fueron enviadas ayer.
The letters were sent yesterday.
Notice how escrito is masculine singular to match el libro, while enviadas is feminine plural to match las cartas. This agreement is not optional: leaving the participle in its default -o form would be ungrammatical.
Agreement in detail
Think of the participle in a passive construction as an adjective attached to the subject. The four possible endings are:
| Subject | Ending | Example |
|---|---|---|
| Masculine singular | -o | fue construido |
| Feminine singular | -a | fue construida |
| Masculine plural | -os | fueron construidos |
| Feminine plural | -as | fueron construidas |
El puente fue construido en 1920.
The bridge was built in 1920.
Las casas fueron construidas por inmigrantes italianos.
The houses were built by Italian immigrants.
Any tense of ser works
Because ser is just an ordinary verb here, you can conjugate it in any tense. The participle stays the same shape within a given sentence; only ser changes.
El informe será presentado mañana por el director.
The report will be presented tomorrow by the director.
Present, preterite, imperfect, future, conditional, compound tenses, and even the subjunctive can all carry the passive. For a refresher on how to form the participle itself, see Past Participle Formation.
Ser vs. estar: action vs. result
Do not confuse the true passive (ser + participle) with the resultant state construction (estar + participle). They look similar but mean very different things:
- Ser
- participle describes an action happening to the subject.
- Estar
- participle describes the state that results from a previous action.
La puerta fue cerrada por Juan means "The door was closed by Juan" (the act of closing). La puerta está cerrada means "The door is closed" (current state). Mixing these up is one of the most common passive-voice mistakes for English speakers.
When is the ser-passive actually used?
Although Spanish avoids this structure in conversation, you will encounter it often in:
- Newspaper headlines and articles
- Legal and academic writing
- Historical narration
- Formal announcements
Everyday speech tends to recast the same idea with active verbs or the se-passive. "La casa fue vendida" is understandable but sounds bookish; most speakers would say se vendió la casa or vendieron la casa.
Common regular and irregular participles
Many high-frequency verbs have irregular participles that appear constantly in passive sentences. A few examples:
La verdad fue dicha por el testigo.
The truth was told by the witness.
Todas las ventanas fueron abiertas por el viento.
All the windows were opened by the wind.
Once you know how to form participles and how ser conjugates, building a passive sentence is mechanical: pick your tense of ser, attach the participle, and make sure it agrees with whatever the subject is.
Related Topics
- Expressing the Agent with PorB2 — Introduce the doer of a passive action with por, and learn when to include or omit it.
- Restrictions on the PassiveB2 — Why the ser-passive is less common in Spanish than in English, and what sentences simply do not work in it.
- Passive Se (Se Venden Casas)B2 — Use se plus a third-person verb to form the passive voice without naming an agent, with the verb agreeing in number with its subject.
- Past Participle FormationA2 — Regular past participles end in -ado for -ar verbs and -ido for -er and -ir verbs, with twelve common irregulars and accented -ído for vowel stems.