Spanish Imperfect Subjunctive: -ra vs -se (Cantara vs Cantase)
Every Spanish student reaching intermediate fluency confronts a puzzling dilemma: every single verb in the imperfect subjunctive has two completely distinct sets of endings: the -ra set (hablara, tuviera, fuera) and the -se set (hablase, tuviese, fuese). Are they completely interchangeable? Which one should you actually use?
⚡ The 30-Second Summary
- In modern standard spoken Spanish, both forms are 100% grammatically equivalent in 95% of contexts (Si tuviera dinero = Si tuviese dinero).
- The -ra forms are vastly more dominant in the Americas (over 90%) and in everyday casual conversations worldwide.
- The -se forms sound slightly more literary, formal, or traditional, and remain common in Spain (peninsular speech and formal literature).
- There is one crucial asymmetric rule: only -ra can occasionally replace the conditional in formal expressions of courtesy ("Quisiera pedirle un favor", never *"Quisiese").
1. Parallel Conjugation Endings
Both forms are derived from the exact same starting point: the 3rd person plural (ellos/ellas) of the Pretérito Indefinido, dropping the final -ron:
| Pronoun | Hablar (-ra Form) | Hablar (-se Form) | Tener (-ra / -se) |
|---|---|---|---|
| yo | hablara | hablase | tuviera / tuviese |
| tú | hablaras | hablases | tuvieras / tuvieses |
| él / ella / usted | hablara | hablase | tuviera / tuviese |
| nosotros/as | habláramos* | hablásemos* | tuviéramos / tuviésemos |
| vosotros/as | hablarais | hablaseis | tuvierais / tuvieseis |
| ellos / ellas / ustedes | hablaran | hablasen | tuvieran / tuviesen |
*Notice that the nosotros form always takes an acute accent on the vowel preceding the ending (habláramos, tuviésemos, fuéramos).
2. The Etymological Secret: Why Do Two Forms Exist?
The dual existence stems directly from Latin verbal morphology:
- The -se ending: Directly inherited from the classical Latin Pluperfect Subjunctive (amavissem → amasse → amase). This was the authentic subjunctive form historically.
- The -ra ending: Originally derived from the Latin Pluperfect Indicative (amaveram → amara). Over centuries in Medieval Spanish, speakers gradually shifted this indicative tense into a subjunctive and conditional function.
3. When Can You NOT Substitute -se for -ra?
While -se and -ra are interchangeable after standard subjunctive triggers (Quería que vinieras / vinieses), there are three specific linguistic exceptions:
A. Polite Formulas (Quisiera, Debiera, Pudiera)
In polite requests where the subjunctive softens a command, only -ra is sanctioned by the Real Academia Española (RAE):
• Correct: "Quisiera pedir un café, por favor." (I would like to order a coffee)
• Incorrect / Unnatural: *"Quisiese pedir un café..."
B. Replacing the Conditional in Apodosis (Si-Clauses)
In literary Spanish, writers sometimes use the -ra form in the result clause instead of the conditional tense. The -se form cannot perform this role:
• "Si tuviera dinero, te ayudara" (Classical alternative to te ayudaría).
• *"...te ayudase" is strictly unacceptable here.
C. Journalistic Relative Clauses (Pluperfect Relic)
In newspapers and literary texts, writers often use -ra as a factual indicative pluperfect (echoing its original Latin root):
• "El que fuera presidente de la república murió ayer." (He who had been president died yesterday).
• -se cannot be used in this indicative relative construction.
🎯 Quick Diagnostic Quiz: -ra vs -se
Which sentence sounds completely natural and grammatically sanctioned for ordering politely?