Mastering the Spanish Future Subjunctive: A Comprehensive Guide

The Spanish future subjunctive, though rarely used in modern spoken Spanish, remains a vital aspect of understanding classical literature and formal writing. Its presence in legal documents, traditional expressions, and certain literary contexts necessitates a firm grasp for advanced Spanish learners.

This guide will demystify the future subjunctive, providing clear explanations, examples, and practice exercises. Whether you’re a student, a translator, or simply a language enthusiast, this article will equip you with the knowledge and skills to confidently navigate this challenging tense.

Table of Contents

Definition of the Spanish Future Subjunctive

The Spanish future subjunctive (futuro de subjuntivo) is a verbal tense that expresses a hypothetical or uncertain action that will occur in the future, typically within subordinate clauses. It’s part of the subjunctive mood, which is used to express doubt, possibility, desire, or subjectivity, rather than factual certainty. Although rarely heard in everyday conversation in modern Spanish, it’s still encountered in legal documents, some set phrases, and classical literature.

The future subjunctive is primarily found in temporal clauses (introduced by conjunctions like cuando, tan pronto como, hasta que, en cuanto) and, less commonly, in conditional clauses. Its function is to convey uncertainty or conditionality about an event that is yet to happen. Understanding this tense is crucial for interpreting older texts and appreciating the nuances of formal Spanish.

The future subjunctive should not be confused with the present subjunctive or the future indicative. While the present subjunctive describes current or future hypothetical actions, the future subjunctive specifically refers to actions that are conceived as taking place at a point *in the future* relative to another future event.

The future indicative, on the other hand, expresses a future action as a certainty. The future subjunctive expresses uncertainty.

Structural Breakdown

Formation of the Future Subjunctive

The future subjunctive is formed by taking the third-person plural (ellos/ellas/ustedes) form of the verb in the preterite indicative, dropping the -ron ending, and adding the following endings:

  • -are
  • -ares
  • -are
  • -áremos
  • -areis
  • -aren

Here’s a breakdown of the conjugation process with examples:

Regular Verbs:

* **Hablar** (to speak):
* Preterite (ellos/ellas/ustedes): Hablaron
* Drop -ron: Habla-
* Future Subjunctive: Hablare, Hablares, Hablare, Habláremos, Hablareis, Hablaren

* **Comer** (to eat):
* Preterite (ellos/ellas/ustedes): Comieron
* Drop -ron: Comie-
* Future Subjunctive: Comiere, Comieres, Comiere, Comiéremos, Comiereis, Comieren

* **Vivir** (to live):
* Preterite (ellos/ellas/ustedes): Vivieron
* Drop -ron: Vivie-
* Future Subjunctive: Viviere, Vivieres, Viviere, Viviéremos, Viviereis, Vivieren

Notice that the accent mark appears on the ‘a’ in the *nosotros* form (-áremos) and on the ‘e’ in the *nosotros* form (-iéremos) of both -er and -ir verbs. This is crucial for correct pronunciation and spelling.

Irregular Verbs in the Future Subjunctive

Many verbs that are irregular in the preterite indicative will also be irregular in the future subjunctive. The irregularity stems from the altered stem in the preterite.

Here are some common irregular verbs:

* **Ser** (to be):
* Preterite (ellos/ellas/ustedes): Fueron
* Drop -ron: Fue-
* Future Subjunctive: Fuere, Fueres, Fuere, Fuéremos, Fuereis, Fueren

* **Estar** (to be):
* Preterite (ellos/ellas/ustedes): Estuvieron
* Drop -ron: Estuvie-
* Future Subjunctive: Estuviere, Estuvieres, Estuviere, Estuviéremos, Estuviereis, Estuvieren

* **Tener** (to have):
* Preterite (ellos/ellas/ustedes): Tuvieron
* Drop -ron: Tuvie-
* Future Subjunctive: Tuviere, Tuvieres, Tuviere, Tuviéremos, Tuviereis, Tuvieren

* **Hacer** (to do/make):
* Preterite (ellos/ellas/ustedes): Hicieron
* Drop -ron: Hicie-
* Future Subjunctive: Hiciere, Hicieres, Hiciere, Hiciéremos, Hiciereis, Hicieren

* **Poder** (to be able to):
* Preterite (ellos/ellas/ustedes): Pudieron
* Drop -ron: Pudie-
* Future Subjunctive: Pudiere, Pudieres, Pudiere, Pudiéremos, Pudiereis, Pudieren

* **Querer** (to want):
* Preterite (ellos/ellas/ustedes): Quisieron
* Drop -ron: Quisie-
* Future Subjunctive: Quisiere, Quisieres, Quisiere, Quisiéremos, Quisiereis, Quisieren

* **Saber** (to know):
* Preterite (ellos/ellas/ustedes): Supieron
* Drop -ron: Supie-
* Future Subjunctive: Supiere, Supieres, Supiere, Supiéremos, Supiereis, Supieren

* **Venir** (to come):
* Preterite (ellos/ellas/ustedes): Vinieron
* Drop -ron: Vinie-
* Future Subjunctive: Viniere, Vinieres, Viniere, Viniéremos, Viniereis, Vinieren

* **Decir** (to say/tell):
* Preterite (ellos/ellas/ustedes): Dijeron
* Drop -ron: Dije-
* Future Subjunctive: Dijere, Dijeres, Dijere, Dijéremos, Dijereis, Dijeren

* **Traer** (to bring):
* Preterite (ellos/ellas/ustedes): Trajeron
* Drop -ron: Traje-
* Future Subjunctive: Trajere, Trajeres, Trajere, Trajéremos, Trajereis, Trajeren

Memorizing the preterite forms of these irregular verbs is essential for correctly conjugating them in the future subjunctive. Remember to identify the correct stem before adding the appropriate endings.

Usage Rules

The future subjunctive is primarily used in formal contexts, particularly in legal and literary texts. Its use is declining in spoken Spanish, but understanding its rules is crucial for comprehending older and formal written works.

Temporal Clauses

The most common use of the future subjunctive is in temporal clauses introduced by conjunctions such as:

* Cuando (when)
* En cuanto (as soon as)
* Tan pronto como (as soon as)
* Hasta que (until)
* Después de que (after)
* Antes de que (before)
* Mientras (while/as long as)

The future subjunctive in these clauses expresses an action that will occur in the future *relative* to the action in the main clause. The main clause typically uses the future indicative or the conditional.

Rule: If the temporal conjunction introduces a future action that is uncertain or hypothetical, use the future subjunctive. If the action is presented as a fact, use the present subjunctive or future indicative (depending on the context and level of certainty).

Conditional Clauses (Archaic)

In older texts, the future subjunctive can appear in conditional clauses introduced by si (if). This usage is now considered archaic and is rarely found in modern Spanish. The contemporary equivalent would use the present subjunctive.

Rule: In archaic texts, if you encounter a conditional clause with si followed by the future subjunctive, it expresses a hypothetical condition in the future. In modern Spanish, replace it with the present subjunctive.

The future subjunctive is often found in legal documents, contracts, and formal agreements. It lends a sense of precision and formality to the language, particularly when outlining conditions and obligations.

Rule: In legal contexts, the future subjunctive emphasizes the binding nature of a condition or obligation that will take effect in the future.

Fixed Expressions

Some fixed expressions retain the future subjunctive, although they are not commonly used in everyday speech. These expressions often have a formal or archaic tone.

Rule: Recognize and understand these fixed expressions as remnants of a once more prevalent grammatical structure.

Examples of the Future Subjunctive

The following provides a multitude of examples to showcase the future subjunctive in action.

Temporal Clause Examples

The following table provides examples of the future subjunctive in temporal clauses. These examples illustrate how the future subjunctive is used with various temporal conjunctions to express actions that will occur in the future relative to another action.

Conjunction Example Translation
Cuando Cuando él llegare, lo sabremos. When he arrives (were he to arrive), we will know it.
Cuando Cuando ella terminare el trabajo, podrá descansar. When she finishes (were she to finish) the work, she can rest.
Cuando Cuando usted fuere a España, visite Sevilla. When you go (were you to go) to Spain, visit Seville.
En cuanto En cuanto nosotros tuviéremos noticias, os informaremos. As soon as we have news (were we to have news), we will inform you.
En cuanto En cuanto ellos pudiéremos, les ayudaremos. As soon as they are able (were they to be able), we will help them.
Tan pronto como Tan pronto como yo recibiere el paquete, te lo enviaré. As soon as I receive (were I to receive) the package, I will send it to you.
Tan pronto como Tan pronto como ella supiere la verdad, nos lo dirá. As soon as she knows (were she to know) the truth, she will tell us.
Hasta que No saldremos hasta que cesare la lluvia. We will not leave until the rain stops (were the rain to stop).
Hasta que No te preocupes hasta que ocurriere algo malo. Don’t worry until something bad happens (were something bad to happen).
Después de que Después de que él hubiere terminado sus estudios, buscará trabajo. After he has finished (were he to have finished) his studies, he will look for work.
Después de que Después de que nosotros viniéremos, la fiesta empezará. After we come (were we to come), the party will start.
Antes de que Antes de que tú te fueres, debes despedirte. Before you leave (were you to leave), you must say goodbye.
Antes de que Antes de que ella lo supiere, ya será tarde. Before she knows it (were she to know it), it will be too late.
Mientras Mientras él viviere, habrá esperanza. While he lives (were he to live), there will be hope.
Mientras Mientras nosotros estuviéremos aquí, todo estará bien. While we are here (were we to be here), everything will be fine.
Cuando Cuando el sol saliere, comenzaremos la caminata. When the sun rises (were the sun to rise), we will begin the hike.
En cuanto En cuanto la nieve cesare, podremos esquiar. As soon as the snow stops (were the snow to stop), we can ski.
Tan pronto como Tan pronto como la campana sonare, saldremos al recreo. As soon as the bell rings (were the bell to ring), we will go out to recess.
Hasta que No revelaremos el secreto hasta que ella nos lo pidiere. We will not reveal the secret until she asks us (were she to ask us).
Después de que Después de que vosotros os hubiereis ido, limpiaremos la casa. After you have left (were you to have left), we will clean the house.
Antes de que Antes de que ellos llegaren, debemos preparar la cena. Before they arrive (were they to arrive), we must prepare dinner.
Mientras Mientras usted permaneciere en este país, respetará nuestras leyes. While you remain (were you to remain) in this country, you will respect our laws.
Cuando Cuando yo tuviere tiempo, te ayudaré con tus deberes. When I have time (were I to have time), I will help you with your homework.
En cuanto En cuanto nosotros recibiéremos el permiso, comenzaremos la construcción. As soon as we receive (were we to receive) the permit, we will begin construction.
Tan pronto como Tan pronto como el avión aterrizare, te llamaré. As soon as the plane lands (were the plane to land), I will call you.
Hasta que No te daré mi respuesta hasta que lo pensare bien. I will not give you my answer until I think it over well (were I to think it over).
Después de que Después de que ella se casare, se mudará a otra ciudad. After she gets married (were she to get married), she will move to another city.
Antes de que Antes de que el invierno llegare, debemos recoger la cosecha. Before winter arrives (were winter to arrive), we must gather the harvest.
Mientras Mientras ella estuviere enferma, la cuidaremos. While she is sick (were she to be sick), we will take care of her.
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The following table provides examples of the future subjunctive in legal documents. These examples demonstrate how the future subjunctive is used to express conditions and obligations in a formal and binding manner.

Context Example Translation
Contract El contrato será válido en cuanto ambas partes lo firmaren. The contract will be valid as soon as both parties sign (were they to sign) it.
Will Lego mi casa a mi hija, siempre que ella la mantuviere en buen estado. I bequeath my house to my daughter, provided that she maintains (were she to maintain) it in good condition.
Law Esta ley entrará en vigor cuando el presidente la sancionare. This law will come into effect when the president approves (were the president to approve) it.
Agreement El acuerdo se considerará cumplido cuando todas las cláusulas se ejecutaren. The agreement will be considered fulfilled when all clauses are executed (were they to be executed).
Terms of Service El usuario aceptará los términos tan pronto como se registrare en el sitio. The user will accept the terms as soon as he registers (were he to register) on the site.
Insurance Policy La póliza cubrirá los daños después de que el asegurado los denunciare. The policy will cover the damages after the insured reports (were the insured to report) them.
Rental Agreement El inquilino pagará la renta mensual antes de que transcurriere el quinto día del mes. The tenant will pay the monthly rent before the fifth day of the month passes (were the fifth day to pass).
Loan Agreement El préstamo será pagado en su totalidad cuando el deudor recibiere los fondos necesarios. The loan will be paid in full when the debtor receives (were the debtor to receive) the necessary funds.
Settlement El litigio se resolverá si las partes acordaren un compromiso. The lawsuit will be resolved if the parties agree (were the parties to agree) to a compromise.
Copyright Los derechos de autor se protegerán hasta que la obra pasare al dominio público. Copyright will be protected until the work enters (were the work to enter) the public domain.
Legislation La nueva regulación aplicará una vez que el parlamento la aprobare. The new regulation will apply once the parliament approves (were the parliament to approve) it.
Judgement La sentencia será firme cuando el acusado no la apelare dentro del plazo estipulado. The sentence will be final when the defendant does not appeal (were the defendant not to appeal) it within the stipulated period.
Warranty La garantía será válida siempre y cuando el comprador conservare el recibo original. The warranty will be valid as long as the buyer keeps (were the buyer to keep) the original receipt.
Deed La propiedad será transferida en el momento en que el vendedor la entregare al comprador. The property will be transferred at the moment the seller delivers (were the seller to deliver) it to the buyer.
Insurance Claim La reclamación será procesada después de que el solicitante proporcionare todos los documentos requeridos. The claim will be processed after the applicant provides (were the applicant to provide) all the required documents.
Authorization La autorización será efectiva una vez que el gerente la firmare. The authorization will be effective once the manager signs (were the manager to sign) it.
Permit El permiso será otorgado cuando el solicitante cumpliere con todos los requisitos. The permit will be granted when the applicant meets (were the applicant to meet) all the requirements.
Licensing Agreement La licencia será renovada si el licenciatario pagare las tarifas correspondientes. The license will be renewed if the licensee pays (were the licensee to pay) the corresponding fees.
Public Notice Esta notificación será válida hasta que el gobierno la derogare. This notice will be valid until the government repeals (were the government to repeal) it.
Confidentiality Agreement El acuerdo de confidencialidad permanecerá en vigor mientras el empleado trabajare para la empresa. The confidentiality agreement will remain in effect while the employee works (were the employee to work) for the company.
Bylaws Los estatutos se modificarán cada vez que la asamblea general lo decidiere. The bylaws will be modified each time the general assembly decides (were the general assembly to decide) so.
Memorandum of Understanding El memorándum de entendimiento se implementará una vez que todas las partes lo ratificaren. The memorandum of understanding will be implemented once all parties ratify (were all parties to ratify) it.
Articles of Incorporation Los artículos de incorporación se registrarán en el momento en que el notario los autenticare. The articles of incorporation will be registered at the moment the notary authenticates (were the notary to authenticate) them.
Power of Attorney El poder notarial será efectivo a partir de la fecha en que el poderdante lo otorgare. The power of attorney will be effective from the date the grantor grants (were the grantor to grant) it.
Service Level Agreement El acuerdo de nivel de servicio se cumplirá siempre que el proveedor mantuviere la disponibilidad del sistema. The service level agreement will be fulfilled as long as the provider maintains (were the provider to maintain) system availability.
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Archaic Conditional Clause Examples

These examples illustrate the archaic usage of the future subjunctive in conditional clauses. Note that in modern Spanish, the present subjunctive would be used instead.

Example Translation (Archaic) Modern Spanish Equivalent
Si yo fuere rey, haría leyes justas. If I were to be king, I would make just laws. Si yo fuera rey, haría leyes justas.
Si tú tuvieres tiempo, ven a visitarme. If you were to have time, come visit me. Si tú tuvieras tiempo, ven a visitarme.
Si él quisiere venir, será bienvenido. If he were to want to come, he will be welcome. Si él quisiera venir, será bienvenido.
Si ella supiere la verdad, estaría muy triste. If she were to know the truth, she would be very sad. Si ella supiera la verdad, estaría muy triste.
Si nosotros pudiéremos ayudarte, lo haríamos. If we were to be able to help you, we would do it. Si nosotros pudiéramos ayudarte, lo haríamos.
Si vosotros fuereis a la fiesta, divertíos mucho. If you were to go to the party, have a lot of fun. Si vosotros fuerais a la fiesta, divertíos mucho.
Si ellos vinieren mañana, los recibiremos con alegría. If they were to come tomorrow, we would receive them with joy. Si ellos vinieran mañana, los recibiremos con alegría.
Si usted estuviere interesado, por favor contáctenos. If you were to be interested, please contact us. Si usted estuviera interesado, por favor contáctenos.
Si yo hiciere eso, me arrepentiría. If I were to do that, I would regret it. Si yo hiciera eso, me arrepentiría.
Si tú dijeres la verdad, te perdonaría. If you were to tell the truth, I would forgive you. Si tú dijeras la verdad, te perdonaría.
Si él viere esa película, le encantaría. If he were to see that movie, he would love it. Si él viera esa película, le encantaría.
Si ella leyere ese libro, aprendería mucho. If she were to read that book, she would learn a lot. Si ella leyera ese libro, aprendería mucho.
Si nosotros escribiéremos una carta, la enviaríamos. If we were to write a letter, we would send it. Si nosotros escribiéramos una carta, la enviaríamos.
Si vosotros comiéremos pizza, estaríamos muy contentos. If you were to eat pizza, we would be very happy. Si vosotros comierais pizza, estaríamos muy contentos.
Si ellos abriere la puerta, entraríamos. If they were to open the door, we would enter. Si ellos abrieran la puerta, entraríamos.

Common Mistakes

One of the most common mistakes is confusing the future subjunctive with the present subjunctive or the future indicative. Remember that the future subjunctive expresses a hypothetical future action, while the present subjunctive refers to current or general hypothetical situations, and the future indicative expresses certainty.

Incorrect Correct Explanation
Cuando él llega, lo sabremos. Cuando él llegare, lo sabremos. Using the present indicative instead of the future subjunctive in a temporal clause expressing a hypothetical future event.
Si yo tendré tiempo, te ayudaré. Si yo tuviere tiempo, te ayudaré. (Archaic)
Si yo tuviera tiempo, te ayudaré. (Modern)
Using the future indicative instead of the future subjunctive (archaic) or the imperfect subjunctive (modern) in a conditional clause.
En cuanto él va a llegar, te llamaré. En cuanto él llegare, te llamaré. Using a periphrastic future (ir + a + infinitive) instead of the future subjunctive in a temporal clause.

Practice Exercises

Exercise 1: Conjugation Practice

Conjugate the following verbs in the future subjunctive for all six pronouns.

Verb Yo Él/Ella/Usted Nosotros Vosotros Ellos/Ellas/Ustedes
Ser
Tener
Decir
Vivir
Hacer
Poder
Venir
Querer
Traer
Saber

Answers:

Verb Yo Él/Ella/Usted Nosotros Vosotros Ellos/Ellas/Ustedes
Ser fuere fueres fuere fuéremos fuereis

fueren
Tener tuviere tuvieres tuviere tuviéremos tuviereis tuvieren
Decir dijere dijeres dijere dijéremos dijereis dijeren
Vivir viviere vivieres viviere viviéremos viviereis vivieren
Hacer hiciere hicieres hiciere hiciéremos hiciereis hicieren
Poder pudiere pudieres pudiere pudiéremos pudiereis pudieren
Venir viniere vinieres viniere viniéremos viniereis vinieren
Querer quisiere quisieres quisiere quisiéremos quisiereis quisieren
Traer trajere trajeres trajere trajéremos trajereis trajeren
Saber supiere supieres supiere supiéremos supiereis supieren

Exercise 2: Sentence Completion

Complete the following sentences with the correct form of the future subjunctive.

  1. Cuando yo ________ (tener) tiempo, te visitaré.
  2. En cuanto tú ________ (llegar), empezaremos la reunión.
  3. Hasta que ella ________ (terminar) su trabajo, no podrá descansar.
  4. Si él ________ (querer) venir, será bienvenido. (Archaic)
  5. El contrato será válido cuando ambas partes lo ________ (firmar).
  6. Después de que nosotros ________ (comer), iremos al cine.
  7. Antes de que ellos ________ (salir), deben cerrar la puerta.
  8. Mientras usted ________ (estar) aquí, respetará las reglas.
  9. Tan pronto como la campana ________ (sonar), saldremos al recreo.
  10. No te preocupes hasta que algo malo ________ (ocurrir).

Answers:

  1. Cuando yo tuviere tiempo, te visitaré.
  2. En cuanto tú llegares, empezaremos la reunión.
  3. Hasta que ella terminare su trabajo, no podrá descansar.
  4. Si él quisiere venir, será bienvenido. (Archaic)
  5. El contrato será válido cuando ambas partes lo firmaren.
  6. Después de que nosotros hubiéremos comido, iremos al cine.
  7. Antes de que ellos salieren, deben cerrar la puerta.
  8. Mientras usted estuviere aquí, respetará las reglas.
  9. Tan pronto como la campana sonare, saldremos al recreo.
  10. No te preocupes hasta que algo malo ocurriere.

Exercise 3: Translation

Translate the following sentences into Spanish, using the future subjunctive where appropriate.

  1. When he arrives, we will know the truth.
  2. As soon as you finish the work, you can leave.
  3. The contract will be valid when both parties sign it.
  4. If I were king, I would make just laws. (Archaic)
  5. We will not leave until the rain stops.
  6. After she graduates, she will travel the world.
  7. Before you leave, say goodbye.
  8. While you are here, you must respect the rules.
  9. As soon as the bell rings, we will go out to recess.
  10. Don’t worry until something bad happens.

Answers:

  1. Cuando él llegare, sabremos la verdad.
  2. En cuanto tú terminares el trabajo, podrás irte.
  3. El contrato será válido cuando ambas partes lo firmaren.
  4. Si yo fuere rey, haría leyes justas. (Archaic)
  5. No saldremos hasta que la lluvia cesare.
  6. Después de que ella se graduare, viajará por el mundo.
  7. Antes de que tú te fueres, despídete.
  8. Mientras usted estuviere aquí, debe respetar las reglas.
  9. Tan pronto como la campana sonare, saldremos al recreo.
  10. No te preocupes hasta que algo malo ocurriere.

Advanced Topics

Literary Usage

In classical Spanish literature, the future subjunctive is more frequently encountered than in modern usage. Authors employed it to add a layer of formality, convey a sense of distance, or evoke a particular historical period.

Recognizing the future subjunctive in literary texts is essential for accurate interpretation and appreciation of the author’s intent.

Example:

In Miguel de Cervantes’ *Don Quixote*, one might find sentences like:

“Y si la fortuna quisiere que yo venza, cumpliré mi promesa.”

Translation: “And if fortune were to will that I conquer, I will fulfill my promise.”

This usage adds to the elevated and somewhat archaic tone of the novel, reflecting the chivalric romances that Don Quixote so admired.

Regional Variations

While the future subjunctive is generally rare across all Spanish-speaking regions today, its usage can vary slightly depending on the area. In some more conservative or formal settings, particularly in legal or academic contexts, it may be encountered more often.

However, it is generally safe to assume that the future subjunctive is not a common feature of spoken language in any region.

Frequently Asked Questions

Is the future subjunctive still used in modern Spanish?

The future subjunctive is rarely used in modern spoken Spanish. It is primarily found in legal documents, formal writing, and classical literature.

What is the difference between the future subjunctive and the present subjunctive?

The future subjunctive refers to hypothetical future actions, while the present subjunctive refers to current or general hypothetical situations.

How do I form the future subjunctive?

The future subjunctive is formed by taking the third-person plural form of the verb in the preterite indicative, dropping the -ron ending, and adding the endings: -are, -ares, -are, -áremos, -areis, -aren.

Are there irregular verbs in the future subjunctive?

Yes, verbs that are irregular in the preterite indicative will also be irregular in the future subjunctive. Their irregularity stems from the altered stem in the preterite.

In what contexts is the future subjunctive used?

The future subjunctive is primarily used in temporal clauses, archaic conditional clauses, legal documents, and some fixed expressions.

Conclusion

While the Spanish future subjunctive may seem like an arcane corner of grammar, mastering it provides a deeper understanding of the Spanish language and its rich literary history. By understanding its formation, usage, and nuances, you’ll be well-equipped to tackle complex texts and appreciate the subtle beauty of formal Spanish writing. So, embrace the challenge, practice diligently, and unlock the secrets of the futuro de subjuntivo!

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