Passive se and impersonal se

Se venden casas.Se vive bien aquí.Houses are sold / Houses for sale.People live well here / One lives well here.

Spanish has two related constructions with se that both let you leave out who's doing the action — but they follow different rules. This is a different se from the reflexive se of reflexive verbs (se levanta, "he gets up") — here nobody is doing anything to themselves.

Quick shortcut: se + verb + a noun phrase with no personal a, which acts as the grammatical subject and gets number agreement from the verb = passive se (Se venden casas, "houses are sold"). se + verb, always third-person singular, with no true subject at all (including when the object is a specific person marked with a) = impersonal se (Se vive bien aquí, "people live well here"; Se busca a los candidatos, "the candidates are being looked for").

Passive se: the verb agrees with what follows

With a transitive verb and no expressed agent, se + verb lets the thing being acted on function as the grammatical subject — and the verb agrees with it in number, just like any subject:

Se vende una casa. (A house is being sold — singular subject, singular verb.) Se venden casas. (Houses are sold — plural subject, plural verb.) Aquí se habla español. (Spanish is spoken here — español stays singular, so the verb does too.)

This is the closest Spanish equivalent to the English passive voice ("houses are sold") without naming who's selling them. The thing being sold, spoken, needed, etc. is grammatically the subject, even though it comes after the verb.

Impersonal se: the verb never changes

When there's no real subject at all — often because the verb is intransitive, or the action is described in a general way with no particular thing "receiving" it — se + verb stays fixed in the third-person singular, no matter what:

Se vive bien aquí. (People live well here / One lives well here.) Se trabaja mucho en esta empresa. (People work a lot at this company.) Se duerme bien con este colchón. (You sleep well with this mattress.)

Vivir, trabajar and dormir here have no direct object to become a subject, so the verb has nothing to agree with — it just stays singular, expressing a general "people in general" or "one" meaning.

Impersonal se with a specific human object: the personal a blocks agreement

Things get more specific — and this is the part that trips learners up — when the verb is transitive and does have a direct object, but that object is a specific person or people, marked with the personal a:

Se busca a los candidatos. (The candidates are being looked for.) Se ve a los niños en el parque. (The children are seen in the park.)

Even though los candidatos and los niños are plural, the verb stays singular. The personal a is the signal: it means the noun is still functioning as a direct object, not as the grammatical subject, so there's nothing for the verb to agree with — this is impersonal se, not passive se, despite the plural noun. Take away the a and the specific person, and the same sentence can become genuinely passive: Se buscan nuevos empleados. (New employees are being sought — no personal a, no specific individuals, plural verb agreeing with empleados.)

Common mistakes

• ❌ Se vende casas. → ✅ Se venden casas. (with a plain plural noun and no personal a, the verb must agree — this is passive se.)
• ❌ Se buscan a los candidatos. → ✅ Se busca a los candidatos. (the personal a marks los candidatos as a direct object, not a subject — the verb can't agree with it, so it stays singular.)
• ❌ Aquí se vive bien las personas. → ✅ Aquí se vive bien. (impersonal se with an intransitive verb like vivir needs no extra noun at all — Spanish expresses this general meaning without naming the people involved, even though English normally needs an overt subject like "people" or "you" to say the same thing.)

Quick check

1. Complete: Se ___ (alquila/alquilan) apartamentos en este edificio.
2. Complete: Se ___ (busca/buscan) a los mejores profesores para este puesto.
3. Why does se stay singular in Se necesita a los voluntarios, even though voluntarios is plural?
4. Rewrite without a personal a, so the verb has to agree: Se contrata a nuevos empleados.

Key takeaways

• Passive se + verb agrees in number with the noun that follows, which acts as the grammatical subject: Se vende una casa / Se venden casas.
• Impersonal se + verb stays fixed in the third-person singular, used with intransitive verbs or general statements with no true subject: Se vive bien aquí.
• A specific human direct object marked with the personal a blocks passive agreement, even if it's plural — the verb stays singular: Se busca a los candidatos.
• Remove the personal a and a specific human object, and the same idea can become genuinely passive, with the verb agreeing: Se buscan nuevos empleados.