estar

to be (state, place)por tiempo-ar irregular
participio estadogerundio estandohe + participio he estadoestoy + gerundio estoy estando

Presentewhat is going on now

Presente

Present — what is happening now, and what happens habitually

yoestoyI amnosotrosestamoswe are
túestásyou arevosotrosestáisyou all are
él/ella/Ud.estáhe/she isellos/Uds.estánthey are

Pretérito perfecto

Present perfect — have —ed; a past still touching now. Spain: today, this week. Latin America: mostly the indefinido instead

yohe estadoI have beennosotroshemos estadowe have been
túhas estadoyou have beenvosotroshabéis estadoyou all have been
él/ella/Ud.ha estadohe/she has beenellos/Uds.han estadothey have been

Presente de subjuntivo

Present subjunctive — after que with wishes, doubt, emotion, ojalá

yoesté(that) I amnosotrosestemos(that) we are
túestés(that) you arevosotrosestéis(that) you all are
él/ella/Ud.esté(that) he/she isellos/Uds.estén(that) they are

Perfecto de subjuntivo

Present perfect subjunctive — have —ed, under doubt or emotion: no creo que haya venido

yohaya estado(that) I have beennosotroshayamos estado(that) we have been
túhayas estado(that) you have beenvosotroshayáis estado(that) you all have been
él/ella/Ud.haya estado(that) he/she has beenellos/Uds.hayan estado(that) they have been

Pasadowhat went on

Pretérito indefinido

Preterite — a finished past action — it started, it ended

yoestuveI wasnosotrosestuvimoswe were
túestuvisteyou werevosotrosestuvisteisyou all were
él/ella/Ud.estuvohe/she wasellos/Uds.estuvieronthey were

Pretérito imperfecto

Imperfect — used to / was —ing; background, habits, descriptions

yoestabaI used to benosotrosestábamoswe used to be
túestabasyou used to bevosotrosestabaisyou all used to be
él/ella/Ud.estabahe/she used to beellos/Uds.estabanthey used to be

Pretérito pluscuamperfecto

Past perfect — had —ed; further back than another past event

yohabía estadoI had beennosotroshabíamos estadowe had been
túhabías estadoyou had beenvosotroshabíais estadoyou all had been
él/ella/Ud.había estadohe/she had beenellos/Uds.habían estadothey had been

Imperfecto de subjuntivo (-ra)

Imperfect subjunctive — si clauses and past-tense wishes: si tuviera, quería que fuera

yoestuviera(that) I wasnosotrosestuviéramos(that) we were
túestuvieras(that) you werevosotrosestuvierais(that) you all were
él/ella/Ud.estuviera(that) he/she wasellos/Uds.estuvieran(that) they were

Imperfecto de subjuntivo (-se)

Imperfect subjunctive — the same tense, second form; commoner in Spain and in writing

yoestuviese(that) I wasnosotrosestuviésemos(that) we were
túestuvieses(that) you werevosotrosestuvieseis(that) you all were
él/ella/Ud.estuviese(that) he/she wasellos/Uds.estuviesen(that) they were

Pluscuamperfecto de subjuntivo

Past perfect subjunctive — had —ed, hypothetically: si hubiera sabido

yohubiera estado(that) I had beennosotroshubiéramos estado(that) we had been
túhubieras estado(that) you had beenvosotroshubierais estado(that) you all had been
él/ella/Ud.hubiera estado(that) he/she had beenellos/Uds.hubieran estado(that) they had been

Pretérito anterior

Preterite perfect — had —ed, immediately before; literary, all but extinct

yohube estadoI had beennosotroshubimos estadowe had been
túhubiste estadoyou had beenvosotroshubisteis estadoyou all had been
él/ella/Ud.hubo estadohe/she had beenellos/Uds.hubieron estadothey had been

Futurowhat will or would go on

Futuro simple

Future — will — (spoken Spanish often prefers voy a + infinitivo)

yoestaréI will benosotrosestaremoswe will be
túestarásyou will bevosotrosestaréisyou all will be
él/ella/Ud.estaráhe/she will beellos/Uds.estaránthey will be

Condicional simple

Conditional — would —; also softens a request into politeness

yoestaríaI would benosotrosestaríamoswe would be
túestaríasyou would bevosotrosestaríaisyou all would be
él/ella/Ud.estaríahe/she would beellos/Uds.estaríanthey would be

Futuro perfecto

Future perfect — will have —ed; done by some future point

yohabré estadoI will have beennosotroshabremos estadowe will have been
túhabrás estadoyou will have beenvosotroshabréis estadoyou all will have been
él/ella/Ud.habrá estadohe/she will have beenellos/Uds.habrán estadothey will have been

Condicional perfecto

Conditional perfect — would have —ed; the road not taken

yohabría estadoI would have beennosotroshabríamos estadowe would have been
túhabrías estadoyou would have beenvosotroshabríais estadoyou all would have been
él/ella/Ud.habría estadohe/she would have beenellos/Uds.habrían estadothey would have been

Futuro de subjuntivo

Future subjunctive — legal and proverbial only: adonde fueres, haz lo que vieres

yoestuviere(should) I benosotrosestuviéremos(should) we be
túestuvieres(should) you bevosotrosestuviereis(should) you all be
él/ella/Ud.estuviere(should) he/she beellos/Uds.estuvieren(should) they be

Imperativotelling someone to

Imperativo afirmativo

Imperative (do it) — orders and requests; there is no yo form

yo—nosotrosestemoslet's be
túestábe!vosotrosestadbe!
él/ella/Ud.estébe!ellos/Uds.esténbe!

Imperativo negativo

Imperative (don't) — no + subjunctive — never the affirmative form with no in front

yo—nosotrosno estemoslet's not be
túno estésdon't bevosotrosno estéisdon't be
él/ella/Ud.no estédon't beellos/Uds.no esténdon't be
PresenteEstoy cansado hoy.I am tired today.
Presente de subjuntivoOjalá que estés bien.I hope you're well.
Pretérito indefinidoEstuvimos en Sevilla dos semanas.We were in Seville for two weeks.
Pretérito imperfectoLa puerta estaba abierta.The door was open.
Futuro simpleEstaré en casa a las ocho.I will be home at eight.
Condicional simpleEstaría mejor con un poco de sal.It would be better with a bit of salt.
Position, condition, mood — and the progressive: estoy comiendo. The irregularity is mostly stress: estoy, estás, está all carry an accent the regular pattern wouldn't give them, and the preterite runs off the strong stem estuv-.
Imagen. Luz de ventana — traducido de Window Light (Tyler Lastovich · stocksnap · CC0)

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

estar

to be (state, place)por persona-ar irregular
participio estadogerundio estandohe + participio he estadoestoy + gerundio estoy estando

yo

I — the speaker

PresenteestoyI am
Perfectohe estadoI have been
Subj. presenteesté(that) I am
Subj. perfectohaya estado(that) I have been
FuturoestaréI will be
CondicionalestaríaI would be
Fut. perfectohabré estadoI will have been
Cond. perfectohabría estadoI would have been
Subj. futuroestuviere(should) I be
IndefinidoestuveI was
ImperfectoestabaI used to be
Pluscuamp.había estadoI had been
Subj. imperf.estuviera(that) I was
Subj. -seestuviese(that) I was
Subj. pluscuamp.hubiera estado(that) I had been
Pret. anteriorhube estadoI had been
Imperativo—
Imper. negativo—

nosotros / nosotras

we — the speaker plus others

Presenteestamoswe are
Perfectohemos estadowe have been
Subj. presenteestemos(that) we are
Subj. perfectohayamos estado(that) we have been
Futuroestaremoswe will be
Condicionalestaríamoswe would be
Fut. perfectohabremos estadowe will have been
Cond. perfectohabríamos estadowe would have been
Subj. futuroestuviéremos(should) we be
Indefinidoestuvimoswe were
Imperfectoestábamoswe used to be
Pluscuamp.habíamos estadowe had been
Subj. imperf.estuviéramos(that) we were
Subj. -seestuviésemos(that) we were
Subj. pluscuamp.hubiéramos estado(that) we had been
Pret. anteriorhubimos estadowe had been
Imperativoestemoslet's be
Imper. negativono estemoslet's not be

tú

you (informal) — one person you are familiar with

Presenteestásyou are
Perfectohas estadoyou have been
Subj. presenteestés(that) you are
Subj. perfectohayas estado(that) you have been
Futuroestarásyou will be
Condicionalestaríasyou would be
Fut. perfectohabrás estadoyou will have been
Cond. perfectohabrías estadoyou would have been
Subj. futuroestuvieres(should) you be
Indefinidoestuvisteyou were
Imperfectoestabasyou used to be
Pluscuamp.habías estadoyou had been
Subj. imperf.estuvieras(that) you were
Subj. -seestuvieses(that) you were
Subj. pluscuamp.hubieras estado(that) you had been
Pret. anteriorhubiste estadoyou had been
Imperativoestábe!
Imper. negativono estésdon't be

vosotros / vosotras

you all — informal plural, Spain only

Presenteestáisyou all are
Perfectohabéis estadoyou all have been
Subj. presenteestéis(that) you all are
Subj. perfectohayáis estado(that) you all have been
Futuroestaréisyou all will be
Condicionalestaríaisyou all would be
Fut. perfectohabréis estadoyou all will have been
Cond. perfectohabríais estadoyou all would have been
Subj. futuroestuviereis(should) you all be
Indefinidoestuvisteisyou all were
Imperfectoestabaisyou all used to be
Pluscuamp.habíais estadoyou all had been
Subj. imperf.estuvierais(that) you all were
Subj. -seestuvieseis(that) you all were
Subj. pluscuamp.hubierais estado(that) you all had been
Pret. anteriorhubisteis estadoyou all had been
Imperativoestadbe!
Imper. negativono estéisdon't be

él / ella / usted

he, she, you (formal) — one other person — formal you shares it

Presenteestáhe/she is
Perfectoha estadohe/she has been
Subj. presenteesté(that) he/she is
Subj. perfectohaya estado(that) he/she has been
Futuroestaráhe/she will be
Condicionalestaríahe/she would be
Fut. perfectohabrá estadohe/she will have been
Cond. perfectohabría estadohe/she would have been
Subj. futuroestuviere(should) he/she be
Indefinidoestuvohe/she was
Imperfectoestabahe/she used to be
Pluscuamp.había estadohe/she had been
Subj. imperf.estuviera(that) he/she was
Subj. -seestuviese(that) he/she was
Subj. pluscuamp.hubiera estado(that) he/she had been
Pret. anteriorhubo estadohe/she had been
Imperativoestébe!
Imper. negativono estédon't be

ellos / ellas / ustedes

they, you all — several others — plural you shares it

Presenteestánthey are
Perfectohan estadothey have been
Subj. presenteestén(that) they are
Subj. perfectohayan estado(that) they have been
Futuroestaránthey will be
Condicionalestaríanthey would be
Fut. perfectohabrán estadothey will have been
Cond. perfectohabrían estadothey would have been
Subj. futuroestuvieren(should) they be
Indefinidoestuvieronthey were
Imperfectoestabanthey used to be
Pluscuamp.habían estadothey had been
Subj. imperf.estuvieran(that) they were
Subj. -seestuviesen(that) they were
Subj. pluscuamp.hubieran estado(that) they had been
Pret. anteriorhubieron estadothey had been
Imperativoesténbe!
Imper. negativono esténdon't be
PresenteEstoy cansado hoy.I am tired today.
Presente de subjuntivoOjalá que estés bien.I hope you're well.
Pretérito indefinidoEstuvimos en Sevilla dos semanas.We were in Seville for two weeks.
Pretérito imperfectoLa puerta estaba abierta.The door was open.
Futuro simpleEstaré en casa a las ocho.I will be home at eight.
Condicional simpleEstaría mejor con un poco de sal.It would be better with a bit of salt.
Position, condition, mood — and the progressive: estoy comiendo. The irregularity is mostly stress: estoy, estás, está all carry an accent the regular pattern wouldn't give them, and the preterite runs off the strong stem estuv-.
Imagen. Luz de ventana — traducido de Window Light (Tyler Lastovich · stocksnap · CC0)

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