The preterite of demostrar is used to express when someone demonstrated or proved something at a specific moment in the past. For example, when you want to say “She demonstrated her skills yesterday” – “Demostró sus habilidades ayer.”
This verb follows the regular -ar conjugation pattern in the preterite tense. Despite being a stem-changing verb in the present tense, it follows regular conjugation patterns in the preterite.
Conjugations
Conjugations of Demostrar (to demonstrate) in the Preterite (Past) Tense tense (Castilian Spanish):
| Pronoun | Conjugation |
|---|---|
| Yo | demostré |
| Tú | demostraste |
| Él / Ella / Usted | demostró |
| Nosotros / Nosotras | demostramos |
| Vosotros / Vosotras | demostrasteis |
| Ellos / Ellas / Ustedes | demostraron |
Boost Your Memorization with Audio!
We’ve included audio recordings of the the conjugations of Demostrar (to demonstrate) in the Preterite (Past) Tense to help you learn faster.
Pro Tip: Play the audio on a loop as you study the chart. This repetition will solidify the correct conjugations in your memory.
Usage of Demostrar in the Preterite (Past) Tense
The Preterite of demostrar indicates when something was proven or demonstrated conclusively.
To prove/demonstrate: Used for showing something definitively, for example Demostró su inocencia (He proved his innocence), or Demostraron su valor (They demonstrated their courage).
To show (feelings/qualities): Describes displaying emotions or characteristics clearly, for example Demostró su amor con acciones (She demonstrated her love through actions).
Examples
Examples of Demostrar in the Preterite (Past) Tense
Demostré mi capacidad en el proyecto. (I demonstrated my ability in the project.)
El equipo demostró su valor en el campeonato. (The team proved their worth in the championship.)
¿Le demostraste tu agradecimiento? (Did you show your gratitude to them?)
Demostramos que estábamos preparados. (We proved that we were prepared.)
Los científicos demostraron su teoría. (The scientists proved their theory.)
Ella demostró ser la mejor candidata. (She proved to be the best candidate.)
Demostraste mucho talento en la presentación. (You showed a lot of talent in the presentation.)
El estudio demostró resultados sorprendentes. (The study demonstrated surprising results.)
Demostramos nuestro compromiso con el proyecto. (We demonstrated our commitment to the project.)
Los estudiantes demostraron su conocimiento en el examen. (The students demonstrated their knowledge in the exam.)
Demostré mi punto con evidencias claras. (I proved my point with clear evidence.)
¿Cómo demostraste tu inocencia? (How did you prove your innocence?)
El experimento demostró la hipótesis. (The experiment proved the hypothesis.)
Demostraron su lealtad en momentos difíciles. (They showed their loyalty in difficult times.)
Les demostramos que estaban equivocados. (We proved to them that they were wrong.)
Conjugations with English Translations
Conjugations of Demostrar (to demonstrate) in the Preterite (Past) Tense tense (Castilian Spanish) with English Translations:
| Spanish | English |
|---|---|
| Yo demostré | I demonstrated |
| Tú demostraste | You demonstrated |
| Él / Ella / Usted demostró | He / She / You (formal) demonstrated |
| Nosotros / Nosotras demostramos | We demonstrated |
| Vosotros / Vosotras demostrasteis | You all demonstrated |
| Ellos / Ellas / Ustedes demostraron | They / You all (formal) demonstrated |
This post covers Castilian Spanish. For Latin American Spanish, click here
Synonyms
The Preterite tense is also known as the Simple Past, Past Simple, Definite Past, Absolute Past, or Past Tense Indicative in English, and as Pretérito Perfecto Simple, Pretérito Indefinido, Pretérito Simple, Pasado Simple, or Pretérito de Indicativo in Spanish.