Advanced temporal clauses I: antes de (que), después de, hasta (que)...

What decides: infinitive, subjunctive, or indicative?

With antes de (que), después de (que), hasta (que) you choose the verb form with a quick checklist:

1. Same subject? → use infinitive.
2. Different subject and the action is pending / not yet real (often future) → use subjunctive.
3. Referring to a completed past moment (“when it happened”) → use indicative (common with desde que, and sometimes hasta que).

Infinitive: when the subject is the same

• Use antes de / después de / hasta + infinitive when the person doing both actions is the same.
• Think: in English you often use “before/after + -ing”. Spanish uses the infinitive.

Correct

• Llámame antes de venir. (You call / you come)
• Te escribiré después de hablar con el especialista. (I write / I talk)
• No salgo hasta terminar el chequeo. (I don’t leave / I finish)

Common trap: don’t add que if you use an infinitive.

• Después de que hacer → Después de hacer

Subjunctive: different subject + not-yet-real (often future)

Use antes de que / después de que / hasta que + subjunctive when:

• the subject changes (I vs they, patient vs doctor), and
• the event is pending, expected, or uncertain at that moment.

Typical “clinic” logic: you are waiting for another person/system to do something.

• Quiero irme antes de que llegue el traumatólogo.
• Recogeré los análisis después de que lleguen los resultados.
• No me opero hasta que el anestesista me explique los riesgos.

Self-check: Can you realistically say “I don’t know if/when it will happen yet”? If yes → subjunctive.

Imperfect subjunctive: “future in the past”

In reported speech and narrative, Spanish often shifts the time “back”.

• If the main verb is in the past and you talk about a later action that was still pending, use imperfect subjunctive.
• Very common after verbs like dijo, me explicó, prometió, and after condicional (would).

Examples

• El médico dijo que decidiría después de que se completaran las pruebas.
• Me dijo que no se marcharía hasta que le entregaran el informe.

Quick pattern

• presente / futuro → que + presente de subjuntivo (llegue, termine, expliquen)
• pasado / condicional → que + imperfecto de subjuntivo (llegara/llegase, terminara/terminase, entregaran/entregasen)

Indicative with desde que (and sometimes hasta que): real past timeline

Desde que normally uses indicative because it anchors to a factual starting point.

• Conozco a Sonia desde que estudiaba medicina.
• Desde que empezó la rehabilitación, mejoró mucho.

Hasta que can be:

• subjunctive when the endpoint was pending at that time: No salgo hasta que me llamen.
• indicative when you narrate a completed past sequence: Se quedaron allí hasta que el médico regresó.

Mini decision map (fast, practical)

1. Do I see “que”?
   • If yes → you need a conjugated verb (subjunctive or indicative).
   • If no → you probably need an infinitive.
2. Is it a factual past moment?
   • Yes → usually indicative (desde que; narrative hasta que).
   • No / not yet at that moment → subjunctive.
3. Is the “waiting” in a past/conditional frame?
   • Yes → imperfect subjunctive.

What you should pay attention to (typical B2 errors)

• Don’t mix forms: antes de + infinitive vs antes de que + subjunctive.
• After “hasta que”, don’t automatically choose indicative: decide if it was pending (subjunctive) or already happened in a story (indicative).
• Time shift: if the main verb is in the past (“he said…”, “she promised…”) your subjunctive often shifts to imperfect subjunctive.