Conjugate demostrar in Spanish
to demonstrate / to prove
demostrar is an irregular -ar verb ranked #131 among the most common Spanish verbs. For example: "Yo demuestro todos los días." (I demonstrate every day.). Use the tables below for full conjugation across all 7 tenses.
demostrar — Spanish Conjugation Chart
to demonstrate / to prove · -ar verb · irregular (stem-changing o>ue) · conjugado.com
Describes current actions, habits, and general truths. The most frequently used tense — master it first.
| Pronoun | Conjugation |
|---|---|
| yo | demuestro * |
| tú | demuestras * |
| él/ella/Ud. | demuestra * |
| nosotros | demostramos |
| vosotros | demostráis |
| ellos/ellas/Uds. | demuestran * |
Yo demuestro todos los días.
I demonstrate every day.
Describes completed past actions with a clear start and end. Key signals: ayer, el lunes pasado, de repente.
| Pronoun | Conjugation |
|---|---|
| yo | demostré |
| tú | demostraste |
| él/ella/Ud. | demostró |
| nosotros | demostramos |
| vosotros | demostrasteis |
| ellos/ellas/Uds. | demostraron |
Nosotros demostramos juntos.
We demonstrate together.
Describes habitual past actions, background context, and ongoing states. Key signals: siempre, normalmente, cuando era niño.
| Pronoun | Conjugation |
|---|---|
| yo | demostraba |
| tú | demostrabas |
| él/ella/Ud. | demostraba |
| nosotros | demostrábamos |
| vosotros | demostrabais |
| ellos/ellas/Uds. | demostraban |
Antes yo demostraba con frecuencia.
Before, I used to demonstrate / to prove often.
Describes future events and predictions. In everyday speech, ir a + infinitive is often preferred for planned events.
| Pronoun | Conjugation |
|---|---|
| yo | demostraré |
| tú | demostrarás |
| él/ella/Ud. | demostrará |
| nosotros | demostraremos |
| vosotros | demostraréis |
| ellos/ellas/Uds. | demostrarán |
Mañana yo demostraré.
Tomorrow I will demonstrate / to prove.
Expresses what would happen under certain conditions — equivalent to "would" in English. Also used for polite requests.
| Pronoun | Conjugation |
|---|---|
| yo | demostraría |
| tú | demostrarías |
| él/ella/Ud. | demostraría |
| nosotros | demostraríamos |
| vosotros | demostraríais |
| ellos/ellas/Uds. | demostrarían |
Si pudiera, yo demostraría.
If I could, I would demonstrate / to prove.
Used in clauses expressing wishes, doubt, emotion, or uncertainty — typically after que. Triggers: querer, esperar, dudar, ojalá.
| Pronoun | Conjugation |
|---|---|
| yo | demuestre * |
| tú | demuestres * |
| él/ella/Ud. | demuestre * |
| nosotros | demostremos |
| vosotros | demostréis |
| ellos/ellas/Uds. | demuestren * |
Quiero que tú demuestres más.
I want you to demonstrate more.
Used to give commands and direct requests. Affirmative and negative forms differ significantly in Spanish.
| Pronoun | Conjugation |
|---|---|
| yo | - |
| tú | demostra |
| él/ella/Ud. | demostre |
| nosotros | demostremos |
| vosotros | demostrad |
| ellos/ellas/Uds. | demostren |
¡Demostra!
Demonstrate / to prove!
Test yourself
Type the correct conjugation for each prompt.
Example sentences
-
Yo demuestro todos los días.
I demonstrate every day.
-
¿Tú demuestras mucho?
Do you demonstrate a lot?
-
Él demuestra con frecuencia.
He demonstrates often.
-
Nosotros demostramos juntos.
We demonstrate together.
-
Ellos demuestran bien.
They demonstrate well.
-
Ayer demostré por primera vez.
Yesterday I demonstrated for the first time.
-
Quiero que tú demuestres más.
I want you to demonstrate more.
-
Es importante demostrar correctamente.
It is important to demonstrate / to prove correctly.
Common phrases with demostrar
- demostrar bien to demonstrate well
- demostrar mucho to demonstrate a lot
- dejar de demostrar to stop demonstrateing
- volver a demostrar to demonstrate again