
demostrar Present Subjunctive Conjugation
demostrar — to prove
Demostrar has a stem change (o > ue) in the subjunctive, except for nosotros and vosotros.
demostrar Present Subjunctive Forms
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
Present
yo: demuestro
Demostrar is an o > ue stem-changing verb in all forms except nosotros and vosotros.
Preterite
yo: demostré
Demostrar is regular in the preterite: demostré, demostraste, demostró, demostramos, demostrasteis, demostraron.
Imperfect
yo: demostraba
Demostrar is regular in the imperfect: demostraba, demostrabas, demostraba, demostrábamos, demostrabais, demostraban.
Future
yo: demostraré
The future of demostrar is regular: demostraré, demostrarás, demostrará, demostraremos, demostraréis, demostrarán.
Conditional
yo: demostraría
The conditional of demostrar is regular: demostraría, demostrarías, demostraría, demostraríamos, demostraríais, demostrarían.
Imperfect Subjunctive
yo: demostrara
The imperfect subjunctive is regular: demostrara, demostraras, demostrara, demostráramos, demostrarais, demostraran.
Affirmative Imperative
yo: demuestra
The imperative uses 'demuestra' (tú) and 'demuestre' (usted), following the o > ue stem change.
Negative Imperative
yo: no demuestres
The negative imperative uses the present subjunctive: no demuestres, no demuestre, no demostremos, no demostréis, no demuestren.