Present — what is happening now, and what happens habitually
| yo | sientoI feel | nosotros | sentimoswe feel |
| tú | sientesyou feel | vosotros | sentísyou all feel |
| él/ella/Ud. | sientehe/she feels | ellos/Uds. | siententhey feel |
Present perfect — have —ed; a past still touching now. Spain: today, this week. Latin America: mostly the indefinido instead
| yo | he sentidoI have felt | nosotros | hemos sentidowe have felt |
| tú | has sentidoyou have felt | vosotros | habéis sentidoyou all have felt |
| él/ella/Ud. | ha sentidohe/she has felt | ellos/Uds. | han sentidothey have felt |
Present subjunctive — after que with wishes, doubt, emotion, ojalá
| yo | sienta(that) I feel | nosotros | sintamos(that) we feel |
| tú | sientas(that) you feel | vosotros | sintáis(that) you all feel |
| él/ella/Ud. | sienta(that) he/she feels | ellos/Uds. | sientan(that) they feel |
Present perfect subjunctive — have —ed, under doubt or emotion: no creo que haya venido
| yo | haya sentido(that) I have felt | nosotros | hayamos sentido(that) we have felt |
| tú | hayas sentido(that) you have felt | vosotros | hayáis sentido(that) you all have felt |
| él/ella/Ud. | haya sentido(that) he/she has felt | ellos/Uds. | hayan sentido(that) they have felt |
Preterite — a finished past action — it started, it ended
| yo | sentíI felt | nosotros | sentimoswe felt |
| tú | sentisteyou felt | vosotros | sentisteisyou all felt |
| él/ella/Ud. | sintióhe/she felt | ellos/Uds. | sintieronthey felt |
Imperfect — used to / was —ing; background, habits, descriptions
| yo | sentíaI used to feel | nosotros | sentíamoswe used to feel |
| tú | sentíasyou used to feel | vosotros | sentíaisyou all used to feel |
| él/ella/Ud. | sentíahe/she used to feel | ellos/Uds. | sentíanthey used to feel |
Past perfect — had —ed; further back than another past event
| yo | había sentidoI had felt | nosotros | habíamos sentidowe had felt |
| tú | habías sentidoyou had felt | vosotros | habíais sentidoyou all had felt |
| él/ella/Ud. | había sentidohe/she had felt | ellos/Uds. | habían sentidothey had felt |
Imperfect subjunctive — si clauses and past-tense wishes: si tuviera, quería que fuera
| yo | sintiera(that) I felt | nosotros | sintiéramos(that) we felt |
| tú | sintieras(that) you felt | vosotros | sintierais(that) you all felt |
| él/ella/Ud. | sintiera(that) he/she felt | ellos/Uds. | sintieran(that) they felt |
Imperfect subjunctive — the same tense, second form; commoner in Spain and in writing
| yo | sintiese(that) I felt | nosotros | sintiésemos(that) we felt |
| tú | sintieses(that) you felt | vosotros | sintieseis(that) you all felt |
| él/ella/Ud. | sintiese(that) he/she felt | ellos/Uds. | sintiesen(that) they felt |
Past perfect subjunctive — had —ed, hypothetically: si hubiera sabido
| yo | hubiera sentido(that) I had felt | nosotros | hubiéramos sentido(that) we had felt |
| tú | hubieras sentido(that) you had felt | vosotros | hubierais sentido(that) you all had felt |
| él/ella/Ud. | hubiera sentido(that) he/she had felt | ellos/Uds. | hubieran sentido(that) they had felt |
Preterite perfect — had —ed, immediately before; literary, all but extinct
| yo | hube sentidoI had felt | nosotros | hubimos sentidowe had felt |
| tú | hubiste sentidoyou had felt | vosotros | hubisteis sentidoyou all had felt |
| él/ella/Ud. | hubo sentidohe/she had felt | ellos/Uds. | hubieron sentidothey had felt |
Future — will — (spoken Spanish often prefers voy a + infinitivo)
| yo | sentiréI will feel | nosotros | sentiremoswe will feel |
| tú | sentirásyou will feel | vosotros | sentiréisyou all will feel |
| él/ella/Ud. | sentiráhe/she will feel | ellos/Uds. | sentiránthey will feel |
Conditional — would —; also softens a request into politeness
| yo | sentiríaI would feel | nosotros | sentiríamoswe would feel |
| tú | sentiríasyou would feel | vosotros | sentiríaisyou all would feel |
| él/ella/Ud. | sentiríahe/she would feel | ellos/Uds. | sentiríanthey would feel |
Future perfect — will have —ed; done by some future point
| yo | habré sentidoI will have felt | nosotros | habremos sentidowe will have felt |
| tú | habrás sentidoyou will have felt | vosotros | habréis sentidoyou all will have felt |
| él/ella/Ud. | habrá sentidohe/she will have felt | ellos/Uds. | habrán sentidothey will have felt |
Conditional perfect — would have —ed; the road not taken
| yo | habría sentidoI would have felt | nosotros | habríamos sentidowe would have felt |
| tú | habrías sentidoyou would have felt | vosotros | habríais sentidoyou all would have felt |
| él/ella/Ud. | habría sentidohe/she would have felt | ellos/Uds. | habrían sentidothey would have felt |
Future subjunctive — legal and proverbial only: adonde fueres, haz lo que vieres
| yo | sintiere(should) I feel | nosotros | sintiéremos(should) we feel |
| tú | sintieres(should) you feel | vosotros | sintiereis(should) you all feel |
| él/ella/Ud. | sintiere(should) he/she feel | ellos/Uds. | sintieren(should) they feel |
Imperative (do it) — orders and requests; there is no yo form
| yo | — | nosotros | sintamoslet's feel |
| tú | sientefeel! | vosotros | sentidfeel! |
| él/ella/Ud. | sientafeel! | ellos/Uds. | sientanfeel! |
Imperative (don't) — no + subjunctive — never the affirmative form with no in front
| yo | — | nosotros | no sintamoslet's not feel |
| tú | no sientasdon't feel | vosotros | no sintáisdon't feel |
| él/ella/Ud. | no sientadon't feel | ellos/Uds. | no sientandon't feel |

Red = the form breaks the regular pattern. Everything in black you could have worked out from the endings alone.
I — the speaker
| Presente | sientoI feel |
| Perfecto | he sentidoI have felt |
| Subj. presente | sienta(that) I feel |
| Subj. perfecto | haya sentido(that) I have felt |
| Futuro | sentiréI will feel |
| Condicional | sentiríaI would feel |
| Fut. perfecto | habré sentidoI will have felt |
| Cond. perfecto | habría sentidoI would have felt |
| Subj. futuro | sintiere(should) I feel |
| Indefinido | sentíI felt |
| Imperfecto | sentíaI used to feel |
| Pluscuamp. | había sentidoI had felt |
| Subj. imperf. | sintiera(that) I felt |
| Subj. -se | sintiese(that) I felt |
| Subj. pluscuamp. | hubiera sentido(that) I had felt |
| Pret. anterior | hube sentidoI had felt |
| Imperativo | — |
| Imper. negativo | — |
we — the speaker plus others
| Presente | sentimoswe feel |
| Perfecto | hemos sentidowe have felt |
| Subj. presente | sintamos(that) we feel |
| Subj. perfecto | hayamos sentido(that) we have felt |
| Futuro | sentiremoswe will feel |
| Condicional | sentiríamoswe would feel |
| Fut. perfecto | habremos sentidowe will have felt |
| Cond. perfecto | habríamos sentidowe would have felt |
| Subj. futuro | sintiéremos(should) we feel |
| Indefinido | sentimoswe felt |
| Imperfecto | sentíamoswe used to feel |
| Pluscuamp. | habíamos sentidowe had felt |
| Subj. imperf. | sintiéramos(that) we felt |
| Subj. -se | sintiésemos(that) we felt |
| Subj. pluscuamp. | hubiéramos sentido(that) we had felt |
| Pret. anterior | hubimos sentidowe had felt |
| Imperativo | sintamoslet's feel |
| Imper. negativo | no sintamoslet's not feel |
you (informal) — one person you are familiar with
| Presente | sientesyou feel |
| Perfecto | has sentidoyou have felt |
| Subj. presente | sientas(that) you feel |
| Subj. perfecto | hayas sentido(that) you have felt |
| Futuro | sentirásyou will feel |
| Condicional | sentiríasyou would feel |
| Fut. perfecto | habrás sentidoyou will have felt |
| Cond. perfecto | habrías sentidoyou would have felt |
| Subj. futuro | sintieres(should) you feel |
| Indefinido | sentisteyou felt |
| Imperfecto | sentíasyou used to feel |
| Pluscuamp. | habías sentidoyou had felt |
| Subj. imperf. | sintieras(that) you felt |
| Subj. -se | sintieses(that) you felt |
| Subj. pluscuamp. | hubieras sentido(that) you had felt |
| Pret. anterior | hubiste sentidoyou had felt |
| Imperativo | sientefeel! |
| Imper. negativo | no sientasdon't feel |
you all — informal plural, Spain only
| Presente | sentísyou all feel |
| Perfecto | habéis sentidoyou all have felt |
| Subj. presente | sintáis(that) you all feel |
| Subj. perfecto | hayáis sentido(that) you all have felt |
| Futuro | sentiréisyou all will feel |
| Condicional | sentiríaisyou all would feel |
| Fut. perfecto | habréis sentidoyou all will have felt |
| Cond. perfecto | habríais sentidoyou all would have felt |
| Subj. futuro | sintiereis(should) you all feel |
| Indefinido | sentisteisyou all felt |
| Imperfecto | sentíaisyou all used to feel |
| Pluscuamp. | habíais sentidoyou all had felt |
| Subj. imperf. | sintierais(that) you all felt |
| Subj. -se | sintieseis(that) you all felt |
| Subj. pluscuamp. | hubierais sentido(that) you all had felt |
| Pret. anterior | hubisteis sentidoyou all had felt |
| Imperativo | sentidfeel! |
| Imper. negativo | no sintáisdon't feel |
he, she, you (formal) — one other person — formal you shares it
| Presente | sientehe/she feels |
| Perfecto | ha sentidohe/she has felt |
| Subj. presente | sienta(that) he/she feels |
| Subj. perfecto | haya sentido(that) he/she has felt |
| Futuro | sentiráhe/she will feel |
| Condicional | sentiríahe/she would feel |
| Fut. perfecto | habrá sentidohe/she will have felt |
| Cond. perfecto | habría sentidohe/she would have felt |
| Subj. futuro | sintiere(should) he/she feel |
| Indefinido | sintióhe/she felt |
| Imperfecto | sentíahe/she used to feel |
| Pluscuamp. | había sentidohe/she had felt |
| Subj. imperf. | sintiera(that) he/she felt |
| Subj. -se | sintiese(that) he/she felt |
| Subj. pluscuamp. | hubiera sentido(that) he/she had felt |
| Pret. anterior | hubo sentidohe/she had felt |
| Imperativo | sientafeel! |
| Imper. negativo | no sientadon't feel |
they, you all — several others — plural you shares it
| Presente | siententhey feel |
| Perfecto | han sentidothey have felt |
| Subj. presente | sientan(that) they feel |
| Subj. perfecto | hayan sentido(that) they have felt |
| Futuro | sentiránthey will feel |
| Condicional | sentiríanthey would feel |
| Fut. perfecto | habrán sentidothey will have felt |
| Cond. perfecto | habrían sentidothey would have felt |
| Subj. futuro | sintieren(should) they feel |
| Indefinido | sintieronthey felt |
| Imperfecto | sentíanthey used to feel |
| Pluscuamp. | habían sentidothey had felt |
| Subj. imperf. | sintieran(that) they felt |
| Subj. -se | sintiesen(that) they felt |
| Subj. pluscuamp. | hubieran sentido(that) they had felt |
| Pret. anterior | hubieron sentidothey had felt |
| Imperativo | sientanfeel! |
| Imper. negativo | no sientandon't feel |

Red = the form breaks the regular pattern. Everything in black you could have worked out from the endings alone.