Demostrar conjugation chart
Demostrar present tense
presente · I speak
| yo | I prove | |
|---|---|---|
| tú | you prove | |
| vos | you prove | |
| él, ella, usted | he/she proves | |
| nosotros | we prove | |
| vosotros | you all prove | |
| ellos, ellas, ustedes | they prove |
The highlighted forms change their stem. Notice that nosotros, vosotros and vos stay out: draw a line around the forms that change and you get a boot, which is why these are called “boot verbs.”
Demostrar preterite
pretérito · I spoke
| yo | I proved | |
|---|---|---|
| tú | you proved | |
| vos | you proved | |
| él, ella, usted | he/she proved | |
| nosotros | we proved | |
| vosotros | you all proved | |
| ellos, ellas, ustedes | they proved |
Regular: same endings as hablar.
Demostrar imperfect
pretérito imperfecto · I used to speak
| yo | I used to prove | |
|---|---|---|
| tú | you used to prove | |
| vos | you used to prove | |
| él, ella, usted | he/she used to prove | |
| nosotros | we used to prove | |
| vosotros | you all used to prove | |
| ellos, ellas, ustedes | they used to prove |
Regular: same endings as hablar.
Demostrar future
futuro · I will speak
| yo | I will prove | |
|---|---|---|
| tú | you will prove | |
| vos | you will prove | |
| él, ella, usted | he/she will prove | |
| nosotros | we will prove | |
| vosotros | you all will prove | |
| ellos, ellas, ustedes | they will prove |
Regular: same endings as hablar.
Demostrar conditional
condicional · I would speak
| yo | I would prove | |
|---|---|---|
| tú | you would prove | |
| vos | you would prove | |
| él, ella, usted | he/she would prove | |
| nosotros | we would prove | |
| vosotros | you all would prove | |
| ellos, ellas, ustedes | they would prove |
Regular: same endings as hablar.
Demostrar present subjunctive
presente de subjuntivo · that I speak
| yo | that I prove | |
|---|---|---|
| tú | that you prove | |
| vos | that you prove | |
| él, ella, usted | that he/she prove | |
| nosotros | that we prove | |
| vosotros | that you all prove | |
| ellos, ellas, ustedes | that they prove |
Irregular in yo, tú, él/ella/usted and ellos/ustedes (in red): demuestre, demuestres…; the other forms are regular.
Demostrar imperfect subjunctive
imperfecto de subjuntivo · if I spoke
| yo | if I proved | |
|---|---|---|
| tú | if you proved | |
| vos | if you proved | |
| él, ella, usted | if he/she proved | |
| nosotros | if we proved | |
| vosotros | if you all proved | |
| ellos, ellas, ustedes | if they proved |
Regular: same endings as hablar.
In the subjunctive, vos takes the same form as tú in careful speech. The imperfect subjunctive also has an -se form (demostrase), more common in writing.
Demostrar affirmative commands
imperativo · speak!
| tú | prove! | |
|---|---|---|
| vos | prove! | |
| usted | prove! | |
| nosotros | let's prove! | |
| vosotros | prove! | |
| ustedes | prove! |
The tú form is the él form of the present: demuestra. Usted, nosotros and ustedes come from the present subjunctive (demuestre, demostremos, demuestren).
Demostrar negative commands
imperativo negativo · don't speak!
| tú | don't prove! | |
|---|---|---|
| vos | don't prove! | |
| usted | don't prove! | |
| nosotros | let's not prove! | |
| vosotros | don't prove! | |
| ustedes | don't prove! |
Built from the present subjunctive: no + demuestres, demuestre…
Always the verb haber + the past participle demostrado, which never changes.
Demostrar present perfect
pretérito perfecto · I have spoken
| yo | he demostrado |
|---|---|
| tú | has demostrado |
| vos | has demostrado |
| él, ella, usted | ha demostrado |
| nosotros | hemos demostrado |
| vosotros | habéis demostrado |
| ellos, ellas, ustedes | han demostrado |
Demostrar pluperfect
pluscuamperfecto · I had spoken
| yo | había demostrado |
|---|---|
| tú | habías demostrado |
| vos | habías demostrado |
| él, ella, usted | había demostrado |
| nosotros | habíamos demostrado |
| vosotros | habíais demostrado |
| ellos, ellas, ustedes | habían demostrado |
Demostrar future perfect
futuro perfecto · I will have spoken
| yo | habré demostrado |
|---|---|
| tú | habrás demostrado |
| vos | habrás demostrado |
| él, ella, usted | habrá demostrado |
| nosotros | habremos demostrado |
| vosotros | habréis demostrado |
| ellos, ellas, ustedes | habrán demostrado |
Demostrar conditional perfect
condicional perfecto · I would have spoken
| yo | habría demostrado |
|---|---|
| tú | habrías demostrado |
| vos | habrías demostrado |
| él, ella, usted | habría demostrado |
| nosotros | habríamos demostrado |
| vosotros | habríais demostrado |
| ellos, ellas, ustedes | habrían demostrado |
Demostrar present perfect subjunctive
pretérito perfecto de subjuntivo · that I have spoken
| yo | haya demostrado |
|---|---|
| tú | hayas demostrado |
| vos | hayas demostrado |
| él, ella, usted | haya demostrado |
| nosotros | hayamos demostrado |
| vosotros | hayáis demostrado |
| ellos, ellas, ustedes | hayan demostrado |
In Latin America, ustedes is the only “you all”; vosotros is used only in Spain. Vos is used in Argentina, Uruguay and much of Central America. Uncheck the boxes above to hide what you don’t need.
Practice demostrar
Type the right form and press Enter. A missing accent still counts, but I'll point it out.
Verbs like demostrar
Stem change o → ue (demostrar → demuestras). Same pattern:
poder puedesvolver vuelvescontar cuentasencontrar encuentrasrecordar recuerdasdormir duermesmorir mueresjugar juegas