Ella VerbsHow to conjugate Demostrar in Spanish
demostrar to demonstrate, to show, to prove Irregular Verb
At a glance: Demostrar (to demonstrate, to show, to prove) is a widely used irregular verbs in Spanish. In the present tense: demuestro, demuestras, demuestra, demostramos, demostráis, demuestran. Yo, tú, ella/él and ellas/ellos change o to ue (demuestro, demuestras, demuestra, demuestran); nosotros and vosotros are regular. It is also irregular in the present subjunctive (demuestre).
- Past participle
- demostrado demonstrated
- Gerund
- demostrando demonstrating
- Similar
- enseñar, mostrar, notarse, probar
Table of contents
- Indicative tenses of Demostrar
- Demostrar in the Indicative Present
- Demostrar in the Indicative Preterite
- Demostrar in the Indicative Imperfect
- Demostrar in the Indicative Present Continuous
- Demostrar in the Indicative Informal Future
- Demostrar in the Indicative Future
- Demostrar in the Indicative Conditional
- Demostrar in the Indicative Present Perfect
- Demostrar in the Indicative Past Perfect
- Demostrar in the Indicative Future Perfect
- Demostrar in the Indicative Conditional Perfect
- Subjunctive tenses of Demostrar
- Imperative tenses of Demostrar
- Verbs that follow the same patterns
- Frequently asked questions
- Downloadable cheat sheet (PDF)
- Practise Demostrar conjugations (free mobile app)
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Indicative tenses of Demostrar
Demostrar in the Indicative Present
The Indicative Present of demostrar is used to talk about situations, events or thoughts that are happening now or in the near future. It is also used to talk about facts and truths. For example, “demuestro”, meaning “I demonstrate”.
In Spanish, the Indicative Present is known as "El Presente".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | demuestro | I demonstrate |
| Tú | demuestras | you demonstrate |
| Ella / Él / Usted | demuestra | s/he demonstrates |
| Nosotras / Nosotros | demostramos | we demonstrate |
| Vosotras / Vosotros | demostráis | you (plural) demonstrate |
| Ellas / Ellos / Ustedes | demuestran | they demonstrate |
How it’s built: Yo, tú, ella/él and ellas/ellos change o to ue (demuestro, demuestras, demuestra, demuestran); nosotros and vosotros are regular.
Letters in red show where a form differs from the regular pattern.
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Demostrar in the Indicative Preterite
The Indicative Preterite of demostrar is used to talk about actions completed in the past, at a specific point in time. For example, “demostré”, meaning “I demonstrated”.
In Spanish, the Indicative Preterite is known as "El Pretérito Indefinido".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | demostré | I demonstrated |
| Tú | demostraste | you demonstrated |
| Ella / Él / Usted | demostró | s/he demonstrated |
| Nosotras / Nosotros | demostramos | we demonstrated |
| Vosotras / Vosotros | demostrasteis | you (plural) demonstrated |
| Ellas / Ellos / Ustedes | demostraron | they demonstrated |
How it’s built: Regular: stem demostr- plus the -ar endings.
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Demostrar in the Indicative Imperfect
The Indicative Imperfect of demostrar is used to describe regular and repeated actions that happened in the past and descriptions of things you used to do. For example, “demostraba”, meaning “I used to demonstrate”.
In Spanish, the Indicative Imperfect is known as "El Pretérito Imperfecto".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | demostraba | I used to demonstrate |
| Tú | demostrabas | you used to demonstrate |
| Ella / Él / Usted | demostraba | s/he used to demonstrate |
| Nosotras / Nosotros | demostrábamos | we used to demonstrate |
| Vosotras / Vosotros | demostrabais | you (plural) used to demonstrate |
| Ellas / Ellos / Ustedes | demostraban | they used to demonstrate |
How it’s built: Regular: stem demostr- plus the -ar endings.
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Demostrar in the Indicative Present Continuous
The Indicative Present Continuous of demostrar is used to talk about something that is happening continuously or right now. For example, “estoy demostrando”, meaning “I am demonstrating”.
In Spanish, the Indicative Present Continuous is known as "El Presente Progresivo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | estoy demostrando | I am demonstrating |
| Tú | estás demostrando | you are demonstrating |
| Ella / Él / Usted | está demostrando | s/he is demonstrating |
| Nosotras / Nosotros | estamos demostrando | we are demonstrating |
| Vosotras / Vosotros | estáis demostrando | you (plural) are demonstrating |
| Ellas / Ellos / Ustedes | están demostrando | they are demonstrating |
How it’s built: Estar in the present (estoy, estás, está, estamos, estáis, están) plus the gerund demostrando.
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Demostrar in the Indicative Informal Future
The Indicative Informal Future of demostrar is used to talk about something that will happen in the future, especially in the near future. For example, “voy a demostrar”, meaning “I am going to demonstrate”.
In Spanish, the Indicative Informal Future is known as "El Futuro Próximo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | voy a demostrar | I am going to demonstrate |
| Tú | vas a demostrar | you are going to demonstrate |
| Ella / Él / Usted | va a demostrar | s/he is going to demonstrate |
| Nosotras / Nosotros | vamos a demostrar | we are going to demonstrate |
| Vosotras / Vosotros | vais a demostrar | you (plural) are going to demonstrate |
| Ellas / Ellos / Ustedes | van a demostrar | they are going to demonstrate |
How it’s built: Ir in the present (voy, vas, va, vamos, vais, van), then a, then the infinitive demostrar.
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Demostrar in the Indicative Future
The Indicative Future of demostrar is used to talk about something that will happen in the future. For example, “demostraré”, meaning “I will demonstrate”.
In Spanish, the Indicative Future is known as "El Futuro Simple".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | demostraré | I will demonstrate |
| Tú | demostrarás | you will demonstrate |
| Ella / Él / Usted | demostrará | s/he will demonstrate |
| Nosotras / Nosotros | demostraremos | we will demonstrate |
| Vosotras / Vosotros | demostraréis | you (plural) will demonstrate |
| Ellas / Ellos / Ustedes | demostrarán | they will demonstrate |
How it’s built: Regular: the infinitive demostrar plus the future endings.
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Demostrar in the Indicative Conditional
The Indicative Conditional of demostrar is used to talk about something that may happen in the future, hypothesis and probabilities. For example, “demostraría”, meaning “I would demonstrate”.
In Spanish, the Indicative Conditional is known as "El Condicional Simple".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | demostraría | I would demonstrate |
| Tú | demostrarías | you would demonstrate |
| Ella / Él / Usted | demostraría | s/he would demonstrate |
| Nosotras / Nosotros | demostraríamos | we would demonstrate |
| Vosotras / Vosotros | demostraríais | you (plural) would demonstrate |
| Ellas / Ellos / Ustedes | demostrarían | they would demonstrate |
How it’s built: Regular: the infinitive demostrar plus the conditional endings.
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Demostrar in the Indicative Present Perfect
The Indicative Present Perfect of demostrar is used to describe actions that started recently (in the past) and are still happening now or things that have been done recently. For example, “he demostrado”, meaning “I have demonstrated”.
In Spanish, the Indicative Present Perfect is known as "El Pretérito Perfecto".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | he demostrado | I have demonstrated |
| Tú | has demostrado | you have demonstrated |
| Ella / Él / Usted | ha demostrado | s/he has demonstrated |
| Nosotras / Nosotros | hemos demostrado | we have demonstrated |
| Vosotras / Vosotros | habéis demostrado | you (plural) have demonstrated |
| Ellas / Ellos / Ustedes | han demostrado | they have demonstrated |
How it’s built: Haber in the present (he, has, ha, hemos, habéis, han) plus the past participle demostrado.
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Demostrar in the Indicative Past Perfect
The Indicative Past Perfect of demostrar is used to talk about actions that happened before another action in the past. For example, “había demostrado”, meaning “I had demonstrated”.
In Spanish, the Indicative Past Perfect is known as "El Pretérito Pluscuamperfecto".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | había demostrado | I had demonstrated |
| Tú | habías demostrado | you had demonstrated |
| Ella / Él / Usted | había demostrado | s/he had demonstrated |
| Nosotras / Nosotros | habíamos demostrado | we had demonstrated |
| Vosotras / Vosotros | habíais demostrado | you (plural) had demonstrated |
| Ellas / Ellos / Ustedes | habían demostrado | they had demonstrated |
How it’s built: Haber in the imperfect (había, habías, había, habíamos, habíais, habían) plus the past participle demostrado.
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Demostrar in the Indicative Future Perfect
The Indicative Future Perfect of demostrar is used to talk about something that will have happened in the future after something else has already happened. For example, “habré demostrado”, meaning “I will have demonstrated”.
In Spanish, the Indicative Future Perfect is known as "El Futuro Perfecto".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | habré demostrado | I will have demonstrated |
| Tú | habrás demostrado | you will have demonstrated |
| Ella / Él / Usted | habrá demostrado | s/he will have demonstrated |
| Nosotras / Nosotros | habremos demostrado | we will have demonstrated |
| Vosotras / Vosotros | habréis demostrado | you (plural) will have demonstrated |
| Ellas / Ellos / Ustedes | habrán demostrado | they will have demonstrated |
How it’s built: Haber in the future (habré, habrás, habrá, habremos, habréis, habrán) plus the past participle demostrado.
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Demostrar in the Indicative Conditional Perfect
The Indicative Conditional Perfect of demostrar is used to talk about something that would have happened in the past but didn’t due to another action. For example, “habría demostrado”, meaning “I would have demonstrated”.
In Spanish, the Indicative Conditional Perfect is known as "El Condicional Perfecto".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | habría demostrado | I would have demonstrated |
| Tú | habrías demostrado | you would have demonstrated |
| Ella / Él / Usted | habría demostrado | s/he would have demonstrated |
| Nosotras / Nosotros | habríamos demostrado | we would have demonstrated |
| Vosotras / Vosotros | habríais demostrado | you (plural) would have demonstrated |
| Ellas / Ellos / Ustedes | habrían demostrado | they would have demonstrated |
How it’s built: Haber in the conditional (habría, habrías, habría, habríamos, habríais, habrían) plus the past participle demostrado.
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Subjunctive tenses of Demostrar
Demostrar in the Subjunctive Present
The Subjunctive Present is used to talk about situations of uncertainty, or emotions such as wishes, desires and hopes. It differs from the indicative mood due to the uncertainty of the events which are being spoken about. For example, “demuestre”, meaning “I demonstrate”.
In Spanish, the Subjunctive Present is known as "El Presente de Subjuntivo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | demuestre | I demonstrate |
| Tú | demuestres | you demonstrate |
| Ella / Él / Usted | demuestre | s/he demonstrates |
| Nosotras / Nosotros | demostremos | we demonstrate |
| Vosotras / Vosotros | demostréis | you (plural) demonstrate |
| Ellas / Ellos / Ustedes | demuestren | they demonstrate |
How it’s built: Yo, tú, ella/él and ellas/ellos follow the yo present, demuestro (demuestre, demuestres, demuestre, demuestren); nosotros and vosotros are regular.
Letters in red show where a form differs from the regular pattern.
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Demostrar in the Subjunctive Imperfect
The Subjunctive Imperfect is used to speak about unlikely or uncertain events in the past or to cast an opinion (emotional) about something that happened in the past. For example, “demostrara”, meaning “I demonstrated”.
In Spanish, the Subjunctive Imperfect is known as "El Imperfecto Subjuntivo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | demostrara | I demonstrated |
| Tú | demostraras | you demonstrated |
| Ella / Él / Usted | demostrara | s/he demonstrated |
| Nosotras / Nosotros | demostráramos | we demonstrated |
| Vosotras / Vosotros | demostrarais | you (plural) demonstrated |
| Ellas / Ellos / Ustedes | demostraran | they demonstrated |
How it’s built: Regular: the ellas/ellos preterite, demostraron, without -ron, plus the -ra endings; nosotros adds an accent (demostráramos).
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Demostrar in the Subjunctive Future
The Subjunctive Future is used to speak about hypothetical situations, and actions/events that may happen in the future. For example, “demostrare”, meaning “I will demonstrate”.
In Spanish, the Subjunctive Future is known as "El Futuro de Subjuntivo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | demostrare | I will demonstrate |
| Tú | demostrares | you will demonstrate |
| Ella / Él / Usted | demostrare | s/he will demonstrate |
| Nosotras / Nosotros | demostráremos | we will demonstrate |
| Vosotras / Vosotros | demostrareis | you (plural) will demonstrate |
| Ellas / Ellos / Ustedes | demostraren | they will demonstrate |
How it’s built: Regular: the ellas/ellos preterite, demostraron, without -ron, plus the -re endings; nosotros adds an accent (demostráremos).
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Demostrar in the Subjunctive Present Perfect
The Subjunctive Present Perfect is used to describe past actions or events that are still connected to the present day and to speak about an action that will have happened by a certain time in the future. For example, “haya demostrado”, meaning “I have demonstrated”.
In Spanish, the Subjunctive Present Perfect is known as "El Pretérito Perfecto de Subjuntivo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | haya demostrado | I have demonstrated |
| Tú | hayas demostrado | you have demonstrated |
| Ella / Él / Usted | haya demostrado | s/he has demonstrated |
| Nosotras / Nosotros | hayamos demostrado | we have demonstrated |
| Vosotras / Vosotros | hayáis demostrado | you (plural) have demonstrated |
| Ellas / Ellos / Ustedes | hayan demostrado | they have demonstrated |
How it’s built: Haber in the subjunctive present (haya, hayas, haya, hayamos, hayáis, hayan) plus the past participle demostrado.
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Demostrar in the Subjunctive Past Perfect
The Subjunctive Past Perfect is used to speak about hypothetical situations, and actions/events that occurred before other actions/events in the past. For example, “hubiera demostrado”, meaning “I had demonstrated”.
In Spanish, the Subjunctive Past Perfect is known as "El Pretérito Pluscuamperfecto de Subjuntivo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | hubiera demostrado | I had demonstrated |
| Tú | hubieras demostrado | you had demonstrated |
| Ella / Él / Usted | hubiera demostrado | s/he had demonstrated |
| Nosotras / Nosotros | hubiéramos demostrado | we had demonstrated |
| Vosotras / Vosotros | hubierais demostrado | you (plural) had demonstrated |
| Ellas / Ellos / Ustedes | hubieran demostrado | they had demonstrated |
How it’s built: Haber in the subjunctive imperfect (hubiera, hubieras, hubiera, hubiéramos, hubierais, hubieran) plus the past participle demostrado.
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Demostrar in the Subjunctive Future Perfect
The Subjunctive Future Perfect is used to speak about something that will have happened if a hypothetical situations occurs in the future. For example, “hubiere demostrado”, meaning “I will have demonstrated”.
In Spanish, the Subjunctive Future Perfect is known as "El Futuro Perfecto de Subjuntivo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | hubiere demostrado | I will have demonstrated |
| Tú | hubieres demostrado | you will have demonstrated |
| Ella / Él / Usted | hubiere demostrado | s/he will have demonstrated |
| Nosotras / Nosotros | hubiéremos demostrado | we will have demonstrated |
| Vosotras / Vosotros | hubiereis demostrado | you (plural) will have demonstrated |
| Ellas / Ellos / Ustedes | hubieren demostrado | they will have demonstrated |
How it’s built: Haber in the subjunctive future (hubiere, hubieres, hubiere, hubiéremos, hubiereis, hubieren) plus the past participle demostrado.
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Imperative tenses of Demostrar
Demostrar in the Imperative Affirmative
The Imperative Affirmative is used to give orders and commands, to tell someone to do something. For example, “demuestre”, meaning “(to you formal) demonstrate!”.
In Spanish, the Imperative Affirmative is known as "El Imperativo Afirmativo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | - | - |
| Tú | demuestra | (to you) demonstrate! |
| Ella / Él / Usted | demuestre | (to you formal) demonstrate! |
| Nosotras / Nosotros | demostremos | let's demonstrate! |
| Vosotras / Vosotros | demostrad | (to you plural) demonstrate! |
| Ellas / Ellos / Ustedes | demuestren | (to you plural formal) demonstrate! |
How it’s built: Tú takes the ella/él present (demuestra); usted, nosotros and ustedes take the subjunctive present (demuestre, demostremos, demuestren); vosotros swaps the final r of the infinitive for a d (demostrad).
Letters in red show where a form differs from the regular pattern.
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Demostrar in the Imperative Negative
The Imperative Negative is used to give orders and commands, telling someone not to do something. For example, “no demuestre”, meaning “(to you formal) don't demonstrate!”.
In Spanish, the Imperative Negative is known as "El Imperativo Negativo".
| Pronoun | Spanish | English |
|---|---|---|
| Yo | - | - |
| Tú | no demuestres | (to you) don't demonstrate! |
| Ella / Él / Usted | no demuestre | (to you formal) don't demonstrate! |
| Nosotras / Nosotros | no demostremos | let's not demonstrate! |
| Vosotras / Vosotros | no demostréis | (to you plural) don't demonstrate! |
| Ellas / Ellos / Ustedes | no demuestren | (to you plural formal) don't demonstrate! |
How it’s built: No plus the subjunctive present: no demuestres, no demuestre, no demostremos, no demostréis, no demuestren.
Letters in red show where a form differs from the regular pattern.
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Frequently asked questions about Demostrar
Is demostrar a regular or irregular verb?
Demostrar is an irregular Spanish verb. In the present tense: yo, tú, ella/él and ellas/ellos change o to ue (demuestro, demuestras, demuestra, demuestran); nosotros and vosotros are regular. It is also irregular in the present subjunctive (demuestre).
How do you conjugate demostrar in the present tense (presente)?
In the present tense (presente), demostrar is conjugated as: yo demuestro, tú demuestras, él/ella/usted demuestra, nosotros demostramos, vosotros demostráis, ellos/ellas/ustedes demuestran. The present tense is used To talk about situations, events or thoughts that are happening now or in the near future. It is also used to talk about facts and truths.
How do you conjugate demostrar in the preterite (pretérito indefinido)?
In the preterite (pretérito indefinido), demostrar is conjugated as: yo demostré, tú demostraste, él/ella/usted demostró, nosotros demostramos, vosotros demostrasteis, ellos/ellas/ustedes demostraron. The preterite is used To talk about actions completed in the past, at a specific point in time.
How do you conjugate demostrar in the imperfect (pretérito imperfecto)?
In the imperfect (pretérito imperfecto), demostrar is conjugated as: yo demostraba, tú demostrabas, él/ella/usted demostraba, nosotros demostrábamos, vosotros demostrabais, ellos/ellas/ustedes demostraban. The imperfect is used To describe regular and repeated actions that happened in the past and descriptions of things you used to do.
How do you conjugate demostrar in the future tense (futuro simple)?
In the future tense (futuro simple), demostrar is conjugated as: yo demostraré, tú demostrarás, él/ella/usted demostrará, nosotros demostraremos, vosotros demostraréis, ellos/ellas/ustedes demostrarán. The future tense is used To talk about something that will happen in the future.
How do you conjugate demostrar in the present subjunctive (subjuntivo presente)?
In the present subjunctive (subjuntivo presente), demostrar is conjugated as: yo demuestre, tú demuestres, él/ella/usted demuestre, nosotros demostremos, vosotros demostréis, ellos/ellas/ustedes demuestren. The present subjunctive is used To talk about situations of uncertainty, or emotions such as wishes, desires and hopes. It differs from the indicative mood due to the uncertainty of the events which are being spoken about.
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Downloadable cheat sheets
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Want to explore other verb conjugations?
Why not check out Denominar – to denominate, to name or see the complete list of verbs here.
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