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SPANISH VERB

demostrar

to prove, to show

  • #142 most used
  • Irregular -ar verb
  • Gerund: demostrando
  • Past participle: demostrado

Conjugation

Tap any form to hear it. The part that changes is in colour.

Present

Presente · now, habits and facts

  1. yo I prove
  2. tú you prove
  3. usted, él, ella he/she proves
  4. nosotros we prove
  5. vosotros Spain you all prove
  6. ustedes, ellos, ellas they prove

Past

Pretérito indefinido · finished actions

  1. yo I proved
  2. tú you proved
  3. usted, él, ella he/she proved
  4. nosotros we proved
  5. vosotros Spain you all proved
  6. ustedes, ellos, ellas they proved

Imperfect

Pretérito imperfecto · “used to” and “was …ing”

  1. yo I used to prove
  2. tú you used to prove
  3. usted, él, ella he/she used to prove
  4. nosotros we used to prove
  5. vosotros Spain you all used to prove
  6. ustedes, ellos, ellas they used to prove

Future

Futuro · plans and promises; in speech, “voy a hablar” is just as common

  1. yo I will prove
  2. tú you will prove
  3. usted, él, ella he/she will prove
  4. nosotros we will prove
  5. vosotros Spain you all will prove
  6. ustedes, ellos, ellas they will prove

Conditional

Condicional · “would”

  1. yo I would prove
  2. tú you would prove
  3. usted, él, ella he/she would prove
  4. nosotros we would prove
  5. vosotros Spain you all would prove
  6. ustedes, ellos, ellas they would prove

Present subjunctive

Presente de subjuntivo · wishes, doubts, “que …”

  1. yo (that) I prove
  2. tú (that) you prove
  3. usted, él, ella (that) he/she prove
  4. nosotros (that) we prove
  5. vosotros Spain (that) you all prove
  6. ustedes, ellos, ellas (that) they prove

Past subjunctive

Imperfecto de subjuntivo · “if I were”, “si …”

  1. yo (if) I proved
  2. tú (if) you proved
  3. usted, él, ella (if) he/she proved
  4. nosotros (if) we proved
  5. vosotros Spain (if) you all proved
  6. ustedes, ellos, ellas (if) they proved

Imperative

Imperativo · requests and orders; a negative one uses the subjunctive (no hables)

  1. tú prove!
  2. usted prove! (formal)
  3. nosotros prove! (let’s)
  4. vosotros Spain prove! (all of you)
  5. ustedes prove! (all of you)

How to use demostrar

One sentence for each tense, the way people say it.

  1. Present

    Ese regalo demuestra cuánto te quiere.

    That gift shows how much he loves you.

  2. Past

    Lucía demostró que sabe cocinar muy bien.

    Lucía proved she can cook very well.

  3. Imperfect

    Mi abuelo nunca demostraba sus sentimientos.

    My grandfather never showed his feelings.

  4. Future

    El tiempo demostrará quién tenía razón.

    Time will show who was right.

  5. Conditional

    Con esa foto demostrarías que estuviste allí.

    With that photo you'd prove you were there.

  6. Present subjunctive

    Quiero que me demuestres que puedes hacerlo solo.

    I want you to show me you can do it alone.

  7. Past subjunctive

    Nos pidieron que demostráramos que vivíamos aquí.

    They asked us to prove we lived here.

  8. Imperative

    ¡Demuéstrale a tu jefe lo que vales!

    Show your boss what you're worth!

Good to know

  • "Demostrar" is to show by proof or by deeds: "demostró que podía".

Verbs like this one

The same pattern, on other verbs: irregular -ar verb.