Anticipate Events with Antes de Que
Antes de que relates one action to another action not yet realized from that viewpoint. Contrast it with antes de plus infinitive when both clauses share a subject.
Learning objective
Sequence anticipated actions with antes de que or a same-subject infinitive construction.
Antes de orders one action before another. With the same subject, use antes de plus an infinitive: Revisé el billete antes de salir. The speaker both checked and left, so no finite second clause is needed.
Con sujetos diferentes, antes de que introduce subjuntivo: Revisé el billete antes de que llegara el taxi. Desde el punto de la revisión, la llegada todavía era un acontecimiento anticipado, aunque quien cuenta la historia ya sepa que ocurrió.
The subjunctive reflects the event's status from the relevant viewpoint, not whether it eventually became real. Present routines use present subjunctive—Cierro las ventanas antes de que empiece la clase—while past sequences commonly use imperfect subjunctive.
La construcción también sirve para prevenir y coordinar: Avísame antes de que cambies la reserva. Si ambas acciones pertenecen al oyente, puedes decir Comprueba el precio antes de cambiarla. Identificar responsables evita elegir por traducción literal.
Examples
Apago el ordenador antes de salir de la oficina.
I turn off the computer before leaving the office.
One subject performs both actions, so salir remains infinitive.
Apago el ordenador antes de que salga el último compañero.
I turn off the computer before the last colleague leaves.
A different subject requires present subjunctive salga.
Compramos agua antes de que empezara la caminata.
We bought water before the walk started.
The anticipated event is later than the completed purchase in a past sequence.
Antes de tomar una decisión, habla conmigo antes de que enviemos la respuesta.
Before making a decision, speak to me before we send the reply.
One sentence assigns the first action to the listener and the later action to us.
Common mistake
- Instead of
- Salimos antes de que empezó la lluvia.
- Try
- Salimos antes de que empezara la lluvia.
At the moment of leaving, the rain was still anticipated, so the changed-subject antes de que clause uses imperfect subjunctive empezara. The later fact that rain began does not convert that earlier perspective into an assertion.
Practice
Try it yourself
Build a six-step travel checklist with a clear sequence. Use three same-person antes de plus infinitive instructions and three changed-subject antes de que clauses involving a driver, a hotel, and a travel companion. Explain who performs every action.