demostrar Negative Imperative Conjugation
demostrar — to prove
The negative imperative uses the present subjunctive: no demuestres, no demuestre, no demostremos, no demostréis, no demuestren.
demostrar Negative Imperative Forms
When to Use the Negative Imperative
Use this to tell someone NOT to show or prove something (e.g., 'Don't show your fear').
Notes on demostrar in the Negative Imperative
It follows the same o > ue stem change rules as the present subjunctive.
Example Sentences
No demuestres miedo ante el perro.
Don't show fear in front of the dog.
tú
No demostremos debilidad ahora.
Let's not show weakness now.
nosotros
Common Mistakes
Mistake: no demuestra (tú)
Correct: no demuestres
Why: Negative commands must use the subjunctive ending (-es), not the indicative ending (-a).
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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.
Present Subjunctive
yo: demuestre
Demostrar has a stem change (o > ue) in the subjunctive, except for nosotros and vosotros.
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.