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A friendly scientist character pointing confidently at a large, clear chart displaying a successful outcome, proving a point to a colleague who looks satisfied.

demostrar Present Subjunctive Conjugation

demostrarto prove

A2irregular (o > ue stem change) -ar★★★★★
Quick answer:

Demostrar has a stem change (o > ue) in the subjunctive, except for nosotros and vosotros.

demostrar Present Subjunctive Forms

yodemuestre
demuestres
él/ella/usteddemuestre
nosotrosdemostremos
vosotrosdemostréis
ellos/ellas/ustedesdemuestren

When to Use the Present Subjunctive

Use this when you want someone to prove something (wishes), or when it's important/doubtful that they show a certain trait.

Notes on demostrar in the Present Subjunctive

The stem change mirrors the present indicative: demuestre, demuestres, demuestre, demostremos, demostréis, demuestren.

Example Sentences

  • Espero que ella demuestre su inocencia.

    I hope she proves her innocence.

    él/ella/usted

  • Es importante que nosotros demostremos respeto.

    It is important that we demonstrate respect.

    nosotros

Common Mistakes

  • Mistake: demuestremos

    Correct: demostremos

    Why: Just like the present indicative, the nosotros form does not take the 'ue' change.

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Related Tenses