demostrar
In the tables below, the stem is shown in black and the ending in purple.
1.Presente
Presente
Habitual actions, general truths, and what's happening now.
| yo | demuestro |
| tú | demuestras |
| él/ella | demuestra |
| nosotros | demostramos |
| vosotros | demostráis |
| ellos/ellas | demuestran |
Ella demuestra su talento en cada actuación.
She demonstrates her talent in every performance.
Los científicos demuestran sus teorías con experimentos.
Scientists demonstrate their theories with experiments.
2.Pretérito Indefinido
Pretérito Indefinido
Completed actions at a specific point in the past.
| yo | demostré |
| tú | demostraste |
| él/ella | demostró |
| nosotros | demostramos |
| vosotros | demostrasteis |
| ellos/ellas | demostraron |
Ayer, él demostró que tenía razón.
Yesterday, he demonstrated that he was right.
El profesor demostró la fórmula en clase.
The teacher demonstrated the formula in class.
3.Imperfecto
Imperfecto
Ongoing or repeated actions in the past, descriptions, and background context.
| yo | demostraba |
| tú | demostrabas |
| él/ella | demostraba |
| nosotros | demostrábamos |
| vosotros | demostrabais |
| ellos/ellas | demostraban |
Cuando era niño, siempre demostraba curiosidad por la ciencia.
When I was a child, I always demonstrated curiosity about science.
Ella demostraba su amor con pequeños gestos.
She demonstrated her love with small gestures.
4.Futuro Simple
Futuro Simple
Future actions, predictions, and speculation about the present.
| yo | demostraré |
| tú | demostrarás |
| él/ella | demostrará |
| nosotros | demostraremos |
| vosotros | demostraréis |
| ellos/ellas | demostrarán |
Mañana, ellos demostrarán sus habilidades en la competencia.
Tomorrow, they will demonstrate their skills in the competition.
Yo demostraré que puedo hacerlo.
I will demonstrate that I can do it.
5.Condicional
Condicional
Hypothetical situations, polite requests, and future-in-the-past.
| yo | demostraría |
| tú | demostrarías |
| él/ella | demostraría |
| nosotros | demostraríamos |
| vosotros | demostraríais |
| ellos/ellas | demostrarían |
Si tuviera tiempo, demostraría cómo se hace.
If I had time, I would demonstrate how it's done.
Ella demostraría su punto si le dieran la oportunidad.
She would demonstrate her point if given the opportunity.
6.Subjuntivo Presente
Subjuntivo Presente
Wishes, doubts, emotions, and subordinate clauses expressing uncertainty.
| yo | demuestre |
| tú | demuestres |
| él/ella | demuestre |
| nosotros | demostremos |
| vosotros | demostréis |
| ellos/ellas | demuestren |
Es importante que él demuestre su compromiso.
It is important that he demonstrates his commitment.
Espero que ellos demuestren su talento en el concurso.
I hope that they demonstrate their talent in the contest.
7.Subjuntivo Imperfecto
Subjuntivo Imperfecto
Past subjunctive contexts, hypothetical si-clauses, and polite suggestions.
| yo | demostrara |
| tú | demostraras |
| él/ella | demostrara |
| nosotros | demostráramos |
| vosotros | demostrarais |
| ellos/ellas | demostraran |
Si él demostrara más interés, podría aprender más.
If he demonstrated more interest, he could learn more.
Ojalá que ella demostrara su habilidad en el proyecto.
I wish she would demonstrate her skill in the project.
"demostrar" in other languages
Related verbs
Common questions
- Is "demostrar" regular or irregular in Spanish?
- "demostrar" is an irregular Spanish verb. It does not follow the standard -ar conjugation pattern and must be memorized.
- How do you conjugate "demostrar" in the present tense?
- In the Presente, "demostrar" conjugates as: demuestras, demuestro, demuestran, and more. See the full table above.
- What is the past tense of "demostrar" in Spanish?
- In the Pretérito Indefinido, "demostrar" conjugates as: demostraste, demostré, demostraron, and more. See the full table above.
- How common is "demostrar" in Spanish?
- "demostrar" (to demonstrate, to prove) is one of the most commonly used verbs in Spanish.