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Lesson 2: Present subjunctive — formation and clause logic

Form first, then function

The present subjunctive is usually built from the 1st person singular present indicative, dropping -o and adding the opposite-vowel endings.

  • hablo → hable, hables, hable, hablemos, habléis, hablen
  • como → coma, comas, coma, comamos, comáis, coman
  • vivo → viva, vivas, viva, vivamos, viváis, vivan

Compact table: venir

Persona Presente de subjuntivo
yo venga
tú vengas
él / ella / usted venga
nosotros/as vengamos
vosotros/as vengáis
ellos / ellas / ustedes vengan

Useful irregular sets to recall quickly:

  • sea, esté, vaya, dé, sepa
  • plus forms built from irregular 1st person presents: tenga, haga, diga, conozca, oiga, ponga, salga, traiga

Clause structure and speaker stance

Mood choice often appears in a structure like:

[main clause expressing stance] + que + [subordinate clause]

Examples:

  • Creo que viene. — the speaker presents viene within an asserting frame.
  • No creo que venga. — the speaker withholds that asserting frame; the subordinate clause appears in the subjunctive.
  • Quiero que vengas. — desire in the main clause; subordinate event in the subjunctive.
  • Me alegra que estés aquí. — evaluation/reaction in the main clause; subordinate clause in the subjunctive.
  • Cuando llegues, llama. — the cuando-clause refers to a future, not-yet-instantiated event, so subjunctive is used.

Do not reduce this to 'indicative = certainty' and 'subjunctive = unreality.' The issue is how the clause is grammatically framed by the speaker, not whether the event is objectively true.

Also: que does not automatically trigger the subjunctive. Compare:

  • Sé que viene.
  • Dudo que venga.

Same conjunction, different matrix meaning, different mood choice.

Which is the better rule?

The second option is the usable rule. Many learners remember lists with que, but the conjunction alone does not determine mood; the matrix clause and the type of subordinate clause do.

Short drills

Pick the single best answer under the stated context.

  1. Context: I don't think he is coming today.
    No creo que él ___ hoy.
    Best form: venga

  2. Context: I know he is coming today.
    Sé que él ___ hoy.
    Best form: viene

  3. Context: Call me when you arrive tomorrow.
    Cuando ___ mañana, llámame.
    Best form: llegues

  4. Context: I'm glad you're here.
    Me alegra que ___ aquí.
    Best form: estés

These are not random triggers. In each case, ask two questions:

  1. Is the clause main or subordinate?
  2. How is the subordinate event being framed: asserted, desired, reacted to, anticipated?

Under the explicit context 'I don't think Ana is at home,' which sentence is best?

The best choice is the present subjunctive in the subordinate clause because the matrix clause No creo que... does not assert the embedded proposition. The present indicative answer is tempting because learners often overextend the idea that the event may still be true in reality; but objective truth is not the deciding factor here. The future form is wrong because the context is present, not future reference. The imperfect form mismatches the time frame and does not fit the stated context.

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