demostrar
to demonstrate
📚 demostrar is a stem-changing verb (o-ue). Learn more in our Stem-Changing Verbs Guide
Non-Conjugated Forms
demostrar
to demonstrate
demostrando
Present Participle
demostrado
Used in perfect tenses
Indicative Mood
Used for statements of fact, certainty, and objective reality
| Person | |||||
|---|---|---|---|---|---|
| yo | demuestro | demostré | demostraba | demostraré | demostraría |
| tú | demuestras | demostraste | demostrabas | demostrarás | demostrarías |
| él/ella/usted | demuestra | demostró | demostraba | demostrará | demostraría |
| nosotros | demostramos | demostramos | demostrábamos | demostraremos | demostraríamos |
| vosotros | demostráis | demostrasteis | demostrabais | demostraréis | demostraríais |
| ellos/ellas/ustedes | demuestran | demostraron | demostraban | demostrarán | demostrarían |
| Quick Test | Quick Test | Quick Test | Quick Test | Quick Test |
Perfect Tenses
Compound tenses using auxiliary verb "haber" + past participle
| Person | ||||
|---|---|---|---|---|
| yo | he demostrado | había demostrado | habré demostrado | habría demostrado |
| tú | has demostrado | habías demostrado | habrás demostrado | habrías demostrado |
| él/ella/usted | ha demostrado | había demostrado | habrá demostrado | habría demostrado |
| nosotros | hemos demostrado | habíamos demostrado | habremos demostrado | habríamos demostrado |
| vosotros | habéis demostrado | habíais demostrado | habréis demostrado | habríais demostrado |
| ellos/ellas/ustedes | han demostrado | habían demostrado | habrán demostrado | habrían demostrado |
| Quick Test | Quick Test | Quick Test | Quick Test |
Subjunctive Mood
Used for doubt, emotion, desire, possibility, and hypothetical situations
| Person | ||
|---|---|---|
| yo | demuestre | demostrara |
| tú | demuestres | demostraras |
| él/ella/usted | demuestre | demostrara |
| nosotros | demostremos | demostráramos |
| vosotros | demostréis | demostrarais |
| ellos/ellas/ustedes | demuestren | demostraran |
| Quick Test | Quick Test |
Imperative Mood
Used for commands, requests, and instructions
| Person | |
|---|---|
| yo | - |
| tú | demostra |
| él/ella/usted | demostre |
| nosotros | demostremos |
| vosotros | demostrad |
| ellos/ellas/ustedes | demostren |
| Quick Test |
🎯 Practice demostrar
Test your knowledge of demostrar conjugations across multiple tenses
Stem Change Pattern: o-ue
This verb follows the o-ue pattern. The stem change occurs in present indicative and present subjunctive, affecting the "boot" forms (yo, tú, él/ella/usted, ellos/ellas/ustedes). Some -ir verbs also have stem changes in preterite (él/ella and ellos/ellas forms).
Usage Tips
- Indicative: Use for facts, statements, and objective reality
- Subjunctive: Use after expressions of doubt, emotion, desire, or uncertainty
- Imperative: Use for direct commands and requests
- Perfect Tenses: Use to express actions completed relative to another time
Examples and Common Phrases
Verb Information
Category
Actions
Ending Type
-ar verb
Verb Type
Stem-changing verb
Importance Rank
#80 out of 100
Usage Tips
Remember the "Boot"
Stem-changing verbs change in a "boot" shape: yo, tú, él/ella, and ellos/ellas change, but nosotros and vosotros don't. Draw a boot around the changing forms to remember!
Practice Suggestion
Try creating your own sentences with this verb. Start with simple present tense sentences and gradually work up to more complex constructions.