Conditional connectors: por si, siempre que…

Conectores condicionales: por si, siempre que…


Los conectores condicionales expresan una condición, una excepción o una prevención en situaciones reales o hipotéticas.

(Conditional connectors express a condition, an exception, or a precaution in real or hypothetical situations.)

What these connectors do (one decision: fact vs. condition)

  • They introduce a condition (what must happen first) or an exception (when your statement does not apply).
  • The key is: do you present the condition as a real/possible fact or as a requirement/hypothesis?
Meaning in your head Typical Spanish choice
“This can realistically happen.” Indicative (often with salvo si / excepto si; and often with por si)
“This is a requirement / condition for it to be true.” Subjunctive (with siempre que, siempre y cuando, con tal de que, a condición de que, a no ser que, salvo que)

Indicative: salvo si / excepto si (real exception)

  • Use these when you treat the exception as a real, checkable situation.
  • Think: “unless/except if X happens (and X can really happen).”

Pattern: Main clause + salvo si / excepto si + indicative

  • Vamos al entrenamiento salvo si hay tormenta.
  • El partido continúa excepto si el árbitro lo suspende.
  • No aparco cerca salvo si hay plazas.

Common pitfall: Don’t switch to subjunctive here just because it “sounds conditional.” If you mean a realistic exception, keep si + indicative.

Subjunctive: requirements and “only if …” conditions

  • These connectors express a condition imposed by the speaker: a requirement, policy, agreement, rule.
  • They often translate as: as long as, provided that, on the condition that.
Connector Best quick translation Verb mood
siempre que as long as / whenever (context decides) Subjunctive
siempre y cuando as long as / provided that Subjunctive
con tal de que provided that / as long as (often more “I don’t mind, as long as…”) Subjunctive
a condición de que on the condition that (formal, contracts/policies) Subjunctive

Examples (notice the subjunctive):

  • El equipo juega mejor siempre que el público lo anime.
  • El club acepta el acuerdo siempre y cuando haya patrocinadores.
  • Te firmo el informe hoy con tal de que me mandes los datos completos antes de las seis.
  • El estadio abre a condición de que respeten las normas.

Subjunctive: a no ser que / salvo que (exception as a hypothesis)

  • These mean unless, but the exception is treated as hypothetical or as a condition you set.
  • They are very common in formal speech and professional contexts (rules, decisions, procedures).

Pattern: Main clause + a no ser que / salvo que + subjunctive

  • No celebramos el triunfo a no ser que sea oficial.
  • El atleta compite salvo que tenga lesión.
  • No cambiamos la fecha del partido a no ser que el árbitro decida suspenderlo.

Quick contrast (very testable):

  • salvo si + indicative = real exception you can verify
  • salvo que + subjunctive = exception presented as hypothetical/conditional

Por si (acaso): “just in case” is special

  • Por si is not “if.” It is about prevention: you do something now as a precaution.
  • It usually goes with the indicative (possible situation).
  • It can also use imperfect subjunctive to sound more remote / less likely.
Meaning Verb form after por si Example
Possible / fairly realistic Indicative Llevo agua por si hace calor.
Less likely / more hypothetical Imperfect subjunctive Llevamos efectivo por si hubiera problemas técnicos.

Common pitfall: Avoid por si se corte (present subjunctive). Standard use is por si se corta (indicative) or por si se cortara (imperfect subjunctive).

Self-check: choose the connector + mood in 10 seconds

  1. Am I taking a precaution now? → use por si.
    • Likely/possible → indicative
    • Remote → imperfect subjunctive
  2. Am I stating an exception that depends on a real fact? (“unless there is…”) → salvo si / excepto si + indicative.
  3. Am I setting a requirement / condition / policy?siempre que, siempre y cuando, con tal de que, a condición de que + subjunctive.
  4. Am I expressing “unless” as a hypothesis/condition?a no ser que / salvo que + subjunctive.

Mini model sentences you can reuse at work

  • Policy / requirement: Aprobamos la solicitud siempre y cuando el cliente envíe la documentación hoy.
  • Formal condition: El reembolso procede a condición de que se presente la factura.
  • Real exception: Mantendremos la reunión salvo si hay una incidencia crítica.
  • Precaution: Imprime una copia por si falla la conexión.
  1. Indicative ⇒ salvo si, excepto si
  2. Subjunctive ⇒ siempre que, siempre y cuando, con tal de que, a condición de que, a no ser que, salvo que
  3. Indicative / Imperfect subjunctive ⇒ por si (acaso)
ConectorEjemplo
Por si (acaso)El aficionado lleva paraguas por si llueve en el estadio. (The fan brings an umbrella in case it rains in the stadium.)
Siempre queEl equipo juega mejor siempre que el público lo anime. (The team plays better as long as the crowd cheers them on.)
Siempre y cuandoEl club acepta el acuerdo siempre y cuando haya patrocinadores. (The club accepts the deal as long as there are sponsors.)
Con tal de queEl jugador entrena duro con tal de que el equipo gane. (The player trains hard as long as the team wins.)
A condición de queEl estadio abre a condición de que respeten las normas. (The stadium opens on the condition that they follow the rules.)
Salvo siVamos al entrenamiento salvo si hay tormenta. (We go to training unless there’s a storm.)
Excepto siEl partido continúa excepto si el árbitro lo suspende. (The match continues unless the referee suspends it.)
A no ser queNo celebramos el triunfo a no ser que sea oficial. (We don’t celebrate the win unless it’s official.)
Salvo queEl atleta compite salvo que tenga lesión. (The athlete competes unless they have an injury.)

Exceptions!

  1. Por si (acaso) ⇒ indicative ⇒ the situation is possible or fairly real (Llevo agua por si hace calor).
  2. Por si (acaso) ⇒ imperfect subjunctive ⇒ the situation is unlikely or more hypothetical (Llevamos efectivo por si hubiera problemas técnicos).

Exercise 1: Multiple choice

Instruction: Choose the correct answer

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1. Lleva una chaqueta ligera ___ refresca cuando termine el partido.

Wear a light jacket ___ it gets chilly when the match ends.

2. Podrás hacerte socio ___ presentes el certificado médico antes de final de mes.

You’ll be able to become a member ___ you submit the medical certificate before the end of the month.

3. El palacio de deportes abre ___ se respeten las normas de evacuación.

The sports arena opens ___ evacuation rules are respected.

4. Iremos al entrenamiento ___ hay alerta naranja por tormenta.

We’ll go to training ___ there is an orange storm warning.

Exercise 2: Rewrite the phrases

Instruction: Join the two sentences into one using the indicated conditional connector (adjust the verb mood: indicative or subjunctive).

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  1. Hint Hint (Por si) Llevo una chaqueta en la mochila. Quizá refresca por la noche.
    ⇒ ____________________________________________________________________________________________________ Example
    Llevo una chaqueta en la mochila por si refresca por la noche.
    (I carry a jacket in my backpack in case it gets chilly at night.)
  2. Hint Hint (Siempre y cuando) La empresa te da el coche de alquiler. Tú lo devuelves con el depósito lleno.
    ⇒ ____________________________________________________________________________________________________ Example
    La empresa te da el coche de alquiler siempre y cuando lo devuelvas con el depósito lleno.
    (The company gives you the rental car as long as you return it with a full tank.)
  3. Hint Hint (Con tal de que) Te firmo el informe hoy. Me mandas los datos completos antes de las seis.
    ⇒ ____________________________________________________________________________________________________ Example
    Te firmo el informe hoy con tal de que me mandes los datos completos antes de las seis.
    (I’ll sign the report for you today provided that you send me the complete data before six.)
  4. Hint Hint (A condición de que) Podemos reservar la sala de reuniones. Respetáis el aforo y dejáis la sala recogida.
    ⇒ ____________________________________________________________________________________________________ Example
    Podemos reservar la sala de reuniones a condición de que respetéis el aforo y dejéis la sala recogida.
    (We can book the meeting room on the condition that you respect the capacity limit and leave the room tidy.)

Exercise 3: Multiple Choice

Instruction: Choose the correct sentence in each case.

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1.
“Salvo que” requires the subjunctive and is used for hypothetical exceptions; here the condition is real, so it is incorrect.
2.
With “por si” you use the indicative for possible situations or the imperfect subjunctive for hypotheses; “por si se corte” (present subjunctive) is not appropriate if it is considered something possible.

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This content has been designed and reviewed by the coLanguage pedagogical team: About coLanguage

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Alessia Amoroso

Master of Languages, Cultures, Communication

Università degli Studi di Modena e Reggio Emilia

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Last Updated:

Monday, 25/05/2026 16:38