demostrar
to demonstrate, to provePresentewhat is going on now
Presente
Present — what is happening now, and what happens habitually
| yo | demuestroI prove | nosotros | demostramoswe prove |
| tú | demuestrasyou prove | vosotros | demostráisyou all prove |
| él/ella/Ud. | demuestrahe/she proves | ellos/Uds. | demuestranthey prove |
Pretérito perfecto
Present perfect — have —ed; a past still touching now. Spain: today, this week. Latin America: mostly the indefinido instead
| yo | he demostradoI have proved | nosotros | hemos demostradowe have proved |
| tú | has demostradoyou have proved | vosotros | habéis demostradoyou all have proved |
| él/ella/Ud. | ha demostradohe/she has proved | ellos/Uds. | han demostradothey have proved |
Presente de subjuntivo
Present subjunctive — after que with wishes, doubt, emotion, ojalá
| yo | demuestre(that) I prove | nosotros | demostremos(that) we prove |
| tú | demuestres(that) you prove | vosotros | demostréis(that) you all prove |
| él/ella/Ud. | demuestre(that) he/she proves | ellos/Uds. | demuestren(that) they prove |
Perfecto de subjuntivo
Present perfect subjunctive — have —ed, under doubt or emotion: no creo que haya venido
| yo | haya demostrado(that) I have proved | nosotros | hayamos demostrado(that) we have proved |
| tú | hayas demostrado(that) you have proved | vosotros | hayáis demostrado(that) you all have proved |
| él/ella/Ud. | haya demostrado(that) he/she has proved | ellos/Uds. | hayan demostrado(that) they have proved |
Pasadowhat went on
Pretérito indefinido
Preterite — a finished past action — it started, it ended
| yo | demostréI proved | nosotros | demostramoswe proved |
| tú | demostrasteyou proved | vosotros | demostrasteisyou all proved |
| él/ella/Ud. | demostróhe/she proved | ellos/Uds. | demostraronthey proved |
Pretérito imperfecto
Imperfect — used to / was —ing; background, habits, descriptions
| yo | demostrabaI used to prove | nosotros | demostrábamoswe used to prove |
| tú | demostrabasyou used to prove | vosotros | demostrabaisyou all used to prove |
| él/ella/Ud. | demostrabahe/she used to prove | ellos/Uds. | demostrabanthey used to prove |
Pretérito pluscuamperfecto
Past perfect — had —ed; further back than another past event
| yo | había demostradoI had proved | nosotros | habíamos demostradowe had proved |
| tú | habías demostradoyou had proved | vosotros | habíais demostradoyou all had proved |
| él/ella/Ud. | había demostradohe/she had proved | ellos/Uds. | habían demostradothey had proved |
Imperfecto de subjuntivo (-ra)
Imperfect subjunctive — si clauses and past-tense wishes: si tuviera, quería que fuera
| yo | demostrara(that) I proved | nosotros | demostráramos(that) we proved |
| tú | demostraras(that) you proved | vosotros | demostrarais(that) you all proved |
| él/ella/Ud. | demostrara(that) he/she proved | ellos/Uds. | demostraran(that) they proved |
Imperfecto de subjuntivo (-se)
Imperfect subjunctive — the same tense, second form; commoner in Spain and in writing
| yo | demostrase(that) I proved | nosotros | demostrásemos(that) we proved |
| tú | demostrases(that) you proved | vosotros | demostraseis(that) you all proved |
| él/ella/Ud. | demostrase(that) he/she proved | ellos/Uds. | demostrasen(that) they proved |
Pluscuamperfecto de subjuntivo
Past perfect subjunctive — had —ed, hypothetically: si hubiera sabido
| yo | hubiera demostrado(that) I had proved | nosotros | hubiéramos demostrado(that) we had proved |
| tú | hubieras demostrado(that) you had proved | vosotros | hubierais demostrado(that) you all had proved |
| él/ella/Ud. | hubiera demostrado(that) he/she had proved | ellos/Uds. | hubieran demostrado(that) they had proved |
Pretérito anterior
Preterite perfect — had —ed, immediately before; literary, all but extinct
| yo | hube demostradoI had proved | nosotros | hubimos demostradowe had proved |
| tú | hubiste demostradoyou had proved | vosotros | hubisteis demostradoyou all had proved |
| él/ella/Ud. | hubo demostradohe/she had proved | ellos/Uds. | hubieron demostradothey had proved |
Futurowhat will or would go on
Futuro simple
Future — will — (spoken Spanish often prefers voy a + infinitivo)
| yo | demostraréI will prove | nosotros | demostraremoswe will prove |
| tú | demostrarásyou will prove | vosotros | demostraréisyou all will prove |
| él/ella/Ud. | demostraráhe/she will prove | ellos/Uds. | demostraránthey will prove |
Condicional simple
Conditional — would —; also softens a request into politeness
| yo | demostraríaI would prove | nosotros | demostraríamoswe would prove |
| tú | demostraríasyou would prove | vosotros | demostraríaisyou all would prove |
| él/ella/Ud. | demostraríahe/she would prove | ellos/Uds. | demostraríanthey would prove |
Futuro perfecto
Future perfect — will have —ed; done by some future point
| yo | habré demostradoI will have proved | nosotros | habremos demostradowe will have proved |
| tú | habrás demostradoyou will have proved | vosotros | habréis demostradoyou all will have proved |
| él/ella/Ud. | habrá demostradohe/she will have proved | ellos/Uds. | habrán demostradothey will have proved |
Condicional perfecto
Conditional perfect — would have —ed; the road not taken
| yo | habría demostradoI would have proved | nosotros | habríamos demostradowe would have proved |
| tú | habrías demostradoyou would have proved | vosotros | habríais demostradoyou all would have proved |
| él/ella/Ud. | habría demostradohe/she would have proved | ellos/Uds. | habrían demostradothey would have proved |
Futuro de subjuntivo
Future subjunctive — legal and proverbial only: adonde fueres, haz lo que vieres
| yo | demostrare(should) I prove | nosotros | demostráremos(should) we prove |
| tú | demostrares(should) you prove | vosotros | demostrareis(should) you all prove |
| él/ella/Ud. | demostrare(should) he/she prove | ellos/Uds. | demostraren(should) they prove |
Imperativotelling someone to
Imperativo afirmativo
Imperative (do it) — orders and requests; there is no yo form
| yo | — | nosotros | demostremoslet's prove |
| tú | demuestraprove! | vosotros | demostradprove! |
| él/ella/Ud. | demuestreprove! | ellos/Uds. | demuestrenprove! |
Imperativo negativo
Imperative (don't) — no + subjunctive — never the affirmative form with no in front
| yo | — | nosotros | no demostremoslet's not prove |
| tú | no demuestresdon't prove | vosotros | no demostréisdon't prove |
| él/ella/Ud. | no demuestredon't prove | ellos/Uds. | no demuestrendon't prove |
Red = the form breaks the regular pattern. Everything in black you could have worked out from the endings alone.