Ser Conjugation | How to Conjugate Ser in Spanish

Ser means “to be.” You will learn its highly irregular present, preterite, imperfect, subjunctive, and command forms, plus regular future/conditional families and its core identity, classification, origin, time, and passive uses.

Ser conjugation at a glance

Verb type: Irregular. Linguistically, ser is highly irregular and has several distinct families: soy / eres / es / somos / sois / son, imperfect era..., preterite fui..., present subjunctive sea..., and past/future subjunctive fuera / fuere....

Ser gerund, past participle, and infinitive

The infinitive names the verb, the gerund supports progressive constructions, and the past participle combines with haber — “to have” as an auxiliary — in compound forms. The participle sido remains invariant in those compounds.

Form	Spanish	Natural English guide
Infinitive	ser	to be
Gerund	siendo	being
Past participle	sido	been

Ser meaning and essential uses

Ser is a copular verb used to identify, classify, define, or characterize a subject: Ana es médica. — “Ana is a doctor.” It also expresses origin or affiliation: Soy de México. — “I am from Mexico.”

Other core uses include possession or relationship with de, time/date, event location, material/composition, and the passive voice with a past participle: La carta fue enviada ayer. — “The letter was sent yesterday.”

Ser irregular conjugation patterns

The present family is soy, eres, es, somos, sois, son — “am / are / is.” The imperfect uses era, eras, era, éramos, erais, eran — “was / were,” while the preterite uses fui, fuiste, fue, fuimos, fuisteis, fueron.

Future and conditional are regular from the infinitive: seré / sería — “I will be / I would be.” Present subjunctive uses sea...; imperfect subjunctive uses fuera / fuese...; future subjunctive uses fuere....

Ser indicative and periphrastic conjugations

Ser present tense conjugation

Present indicative (el presente de indicativo) — Use it for current situations, habits, facts, and contextually near-future reference. This family is highly irregular: soy, eres, es, somos, sois, son.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	soy	I am
Tú — you, singular informal	eres	you are
Él / Ella / Usted — he / she / you, singular formal	es	he / she is; you are (formal)
Nosotros / Nosotras — we	somos	we are
Vosotros / Vosotras — you, plural informal, mainly Spain	sois	you are (plural)
Ellos / Ellas / Ustedes — they / you, plural	son	they are; you are (plural)

• Soy profesor de español. — I am a Spanish teacher.

Ser preterite conjugation

Preterite (el pretérito perfecto simple / pretérito indefinido) — Use it for completed or bounded past events. The preterite is fui, fuiste, fue, fuimos, fuisteis, fueron; context distinguishes these forms from the identical preterite forms of another verb.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	fui	I was
Tú — you, singular informal	fuiste	you were
Él / Ella / Usted — he / she / you, singular formal	fue	he / she was; you were (formal)
Nosotros / Nosotras — we	fuimos	we were
Vosotros / Vosotras — you, plural informal, mainly Spain	fuisteis	you were (plural)
Ellos / Ellas / Ustedes — they / you, plural	fueron	they were; you were (plural)

• La reunión fue muy breve. — The meeting was very brief.

Ser imperfect conjugation

Imperfect (el pretérito imperfecto) — Use it for habitual, descriptive, background, or ongoing past situations. The imperfect uses the irregular era- family.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	era	I was / used to be
Tú — you, singular informal	eras	you were / used to be
Él / Ella / Usted — he / she / you, singular formal	era	he / she was; you were (formal)
Nosotros / Nosotras — we	éramos	we were / used to be
Vosotros / Vosotras — you, plural informal, mainly Spain	erais	you were / used to be (plural)
Ellos / Ellas / Ustedes — they / you, plural	eran	they were / used to be; you were (plural)

• De niño era muy tímido. — As a child, I was very shy.

Ser present progressive

Present progressive — This verbal periphrasis focuses on an action or process in progress. Estar + siendo is natural when emphasizing temporary behavior, a developing situation, or an ongoing passive process.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	estoy siendo	I am being
Tú — you, singular informal	estás siendo	you are being
Él / Ella / Usted — he / she / you, singular formal	está siendo	he / she is being; you are being (formal)
Nosotros / Nosotras — we	estamos siendo	we are being
Vosotros / Vosotras — you, plural informal, mainly Spain	estáis siendo	you are being (plural)
Ellos / Ellas / Ustedes — they / you, plural	están siendo	they are being; you are being (plural)

• Estoy siendo muy claro contigo. — I am being very clear with you.

Ser near future conjugation

Near future — This verbal periphrasis expresses an intention, plan, or expected event. Form it with present ir — “to go” — plus a — “to” — and ser.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	voy a ser	I am going to be
Tú — you, singular informal	vas a ser	you are going to be
Él / Ella / Usted — he / she / you, singular formal	va a ser	he / she is going to be; you are going to be (formal)
Nosotros / Nosotras — we	vamos a ser	we are going to be
Vosotros / Vosotras — you, plural informal, mainly Spain	vais a ser	you are going to be (plural)
Ellos / Ellas / Ustedes — they / you, plural	van a ser	they are going to be; you are going to be (plural)

• Voy a ser más cuidadoso. — I am going to be more careful.

Ser future tense conjugation

Simple future (el futuro simple) — Use it for future reference and, where useful, probability. The table uses the verified paradigm.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	seré	I will be
Tú — you, singular informal	serás	you will be
Él / Ella / Usted — he / she / you, singular formal	será	he / she will be; you will be (formal)
Nosotros / Nosotras — we	seremos	we will be
Vosotros / Vosotras — you, plural informal, mainly Spain	seréis	you will be (plural)
Ellos / Ellas / Ustedes — they / you, plural	serán	they will be; you will be (plural)

• Seremos responsables de esta parte. — We will be responsible for this part.

Ser conditional conjugation

Conditional (el condicional simple) — Use it for hypothetical outcomes, softened statements, or related conditional meanings. The table uses the verified paradigm.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	sería	I would be
Tú — you, singular informal	serías	you would be
Él / Ella / Usted — he / she / you, singular formal	sería	he / she would be; you would be (formal)
Nosotros / Nosotras — we	seríamos	we would be
Vosotros / Vosotras — you, plural informal, mainly Spain	seríais	you would be (plural)
Ellos / Ellas / Ustedes — they / you, plural	serían	they would be; you would be (plural)

• Sería mejor esperar. — It would be better to wait.

Ser present perfect conjugation

Present perfect (el pretérito perfecto compuesto) — Use it for completed events connected to a present reference frame; regional distribution varies. Form it with the appropriate form of haber — “to have” as an auxiliary — plus the invariant participle sido.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	he sido	I have been
Tú — you, singular informal	has sido	you have been
Él / Ella / Usted — he / she / you, singular formal	ha sido	he / she has been; you have been (formal)
Nosotros / Nosotras — we	hemos sido	we have been
Vosotros / Vosotras — you, plural informal, mainly Spain	habéis sido	you have been (plural)
Ellos / Ellas / Ustedes — they / you, plural	han sido	they have been; you have been (plural)

• He sido muy paciente. — I have been very patient.

Ser past perfect conjugation

Past perfect (el pretérito pluscuamperfecto) — Use it for an event completed before another past reference point. Form it with the appropriate form of haber — “to have” as an auxiliary — plus the invariant participle sido.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	había sido	I had been
Tú — you, singular informal	habías sido	you had been
Él / Ella / Usted — he / she / you, singular formal	había sido	he / she had been; you had been (formal)
Nosotros / Nosotras — we	habíamos sido	we had been
Vosotros / Vosotras — you, plural informal, mainly Spain	habíais sido	you had been (plural)
Ellos / Ellas / Ustedes — they / you, plural	habían sido	they had been; you had been (plural)

• Ya había sido director antes. — He had already been a director before.

Ser future perfect conjugation

Future perfect (el futuro perfecto) — Use it for an event expected to be completed before a future reference point. Form it with the appropriate form of haber — “to have” as an auxiliary — plus the invariant participle sido.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	habré sido	I will have been
Tú — you, singular informal	habrás sido	you will have been
Él / Ella / Usted — he / she / you, singular formal	habrá sido	he / she will have been; you will have been (formal)
Nosotros / Nosotras — we	habremos sido	we will have been
Vosotros / Vosotras — you, plural informal, mainly Spain	habréis sido	you will have been (plural)
Ellos / Ellas / Ustedes — they / you, plural	habrán sido	they will have been; you will have been (plural)

• Para entonces habrán sido socios durante diez años. — By then they will have been partners for ten years.

Ser conditional perfect conjugation

Conditional perfect (el condicional compuesto) — Use it for a hypothetical completed outcome. Form it with the appropriate form of haber — “to have” as an auxiliary — plus the invariant participle sido.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	habría sido	I would have been
Tú — you, singular informal	habrías sido	you would have been
Él / Ella / Usted — he / she / you, singular formal	habría sido	he / she would have been; you would have been (formal)
Nosotros / Nosotras — we	habríamos sido	we would have been
Vosotros / Vosotras — you, plural informal, mainly Spain	habríais sido	you would have been (plural)
Ellos / Ellas / Ustedes — they / you, plural	habrían sido	they would have been; you would have been (plural)

• Habría sido más fácil con ayuda. — It would have been easier with help.

Ser subjunctive conjugations

Ser present subjunctive conjugation

Present subjunctive (el presente de subjuntivo) — Use it in subordinate environments involving wishes, influence, emotion, doubt or denial, evaluation, necessity, possibility, or non-specific reference. The present subjunctive uses the irregular sea- family.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	sea	that I be
Tú — you, singular informal	seas	that you be
Él / Ella / Usted — he / she / you, singular formal	sea	that he / she be; that you be (formal)
Nosotros / Nosotras — we	seamos	that we be
Vosotros / Vosotras — you, plural informal, mainly Spain	seáis	that you be (plural)
Ellos / Ellas / Ustedes — they / you, plural	sean	that they be; that you be (plural)

• Quiero que seas sincero. — I want you to be honest.

Ser imperfect subjunctive conjugation

Imperfect subjunctive (el imperfecto de subjuntivo) — The main table uses the -ra series. The accepted -se series is also valid in many contexts and is demonstrated after the table. The main table uses the fuera series; the accepted alternative is the fuese series.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	fuera	that I were / was
Tú — you, singular informal	fueras	that you were
Él / Ella / Usted — he / she / you, singular formal	fuera	that he / she were / was; that you were (formal)
Nosotros / Nosotras — we	fuéramos	that we were
Vosotros / Vosotras — you, plural informal, mainly Spain	fuerais	that you were (plural)
Ellos / Ellas / Ustedes — they / you, plural	fueran	that they were; that you were (plural)

• Preferían que fuéramos más puntuales. — They preferred that we be more punctual.
• Era importante que fueses consciente del riesgo. — It was important that you be aware of the risk.

Ser future subjunctive conjugation

Future subjunctive (el futuro de subjuntivo) — Rare in modern everyday Spanish. It survives mainly in formal, legal, proverbial, literary, or historical contexts. These rare forms use the fuere family.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	fuere	if / when I should be
Tú — you, singular informal	fueres	if / when you should be
Él / Ella / Usted — he / she / you, singular formal	fuere	if / when he / she should be; if / when you should be (formal)
Nosotros / Nosotras — we	fuéremos	if / when we should be
Vosotros / Vosotras — you, plural informal, mainly Spain	fuereis	if / when you should be (plural)
Ellos / Ellas / Ustedes — they / you, plural	fueren	if / when they should be; if / when you should be (plural)

• Quien fuere responsable deberá presentar el informe. — Whoever should be responsible must submit the report.

Ser present perfect subjunctive conjugation

Present perfect subjunctive (el pretérito perfecto de subjuntivo) — Use it when a completed event appears inside a present- or future-oriented subjunctive environment. Form it with the appropriate form of haber — “to have” as an auxiliary — plus the invariant participle sido.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	haya sido	that I have been
Tú — you, singular informal	hayas sido	that you have been
Él / Ella / Usted — he / she / you, singular formal	haya sido	that he / she has been; that you have been (formal)
Nosotros / Nosotras — we	hayamos sido	that we have been
Vosotros / Vosotras — you, plural informal, mainly Spain	hayáis sido	that you have been (plural)
Ellos / Ellas / Ustedes — they / you, plural	hayan sido	that they have been; that you have been (plural)

• Me alegra que hayas sido sincero. — I am glad that you were honest.

Ser past perfect subjunctive conjugation

Past perfect subjunctive (el pluscuamperfecto de subjuntivo) — The main table uses hubiera; hubiese is an accepted auxiliary alternative in many contexts and is demonstrated after the table. Form it with the appropriate form of haber — “to have” as an auxiliary — plus the invariant participle sido.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	hubiera sido	that I had been
Tú — you, singular informal	hubieras sido	that you had been
Él / Ella / Usted — he / she / you, singular formal	hubiera sido	that he / she had been; that you had been (formal)
Nosotros / Nosotras — we	hubiéramos sido	that we had been
Vosotros / Vosotras — you, plural informal, mainly Spain	hubierais sido	that you had been (plural)
Ellos / Ellas / Ustedes — they / you, plural	hubieran sido	that they had been; that you had been (plural)

• Si hubiera sido más temprano, habríamos salido. — If it had been earlier, we would have left.
• Si hubieses sido más cuidadoso, no habría ocurrido. — If you had been more careful, it would not have happened.

Ser future perfect subjunctive conjugation

Future perfect subjunctive (el futuro perfecto de subjuntivo) — Rare in modern everyday Spanish. Treat it as a formal or historical reference form, not an everyday conversational target. Form it with the appropriate form of haber — “to have” as an auxiliary — plus the invariant participle sido.

Pronoun and English meaning	Spanish	Natural English guide
Yo — I	hubiere sido	if / when I should have been
Tú — you, singular informal	hubieres sido	if / when you should have been
Él / Ella / Usted — he / she / you, singular formal	hubiere sido	if / when he / she should have been; if / when you should have been (formal)
Nosotros / Nosotras — we	hubiéremos sido	if / when we should have been
Vosotros / Vosotras — you, plural informal, mainly Spain	hubiereis sido	if / when you should have been (plural)
Ellos / Ellas / Ustedes — they / you, plural	hubieren sido	if / when they should have been; if / when you should have been (plural)

• Si hubieren sido informados, deberán confirmarlo. — If they should have been informed, they must confirm it.

Ser imperative and commands

Commands address another person directly. The nosotros/nosotras row is a present-subjunctive form used with exhortative “let’s…” value.

Ser affirmative commands

Use the verified affirmative command forms for direct instructions when the target meaning supports them naturally.

Pronoun and English meaning	Spanish	Natural English guide
Tú — you, singular informal	sé	be
Usted — you, singular formal	sea	be (formal)
Nosotros / Nosotras — we; let’s…	seamos	let’s be
Vosotros / Vosotras — you, plural informal, mainly Spain	sed	be (plural, mainly Spain)
Ustedes — you, plural	sean	be (plural)

• Sé paciente. — Be patient.

Ser negative commands

Negative commands use subjunctive-based forms, with no — “not / do not” — before the verb.

Pronoun and English meaning	Spanish	Natural English guide
Tú — you, singular informal	no seas	do not be
Usted — you, singular formal	no sea	do not be (formal)
Nosotros / Nosotras — we; let’s…	no seamos	let’s not be
Vosotros / Vosotras — you, plural informal, mainly Spain	no seáis	do not be (plural, mainly Spain)
Ustedes — you, plural	no sean	do not be (plural)

• No seas impaciente. — Do not be impatient.

Common constructions with Ser

These patterns show sentence frames that materially affect how the target verb is used.

• ser + noun / adjective. — to identify, classify, define, or characterize.
• ser de + place / person / material. — to express origin, possession, affiliation, or material.
• ser + time / date expression. — to tell time or identify a date.
• ser + past participle. — to form a passive construction.

Example sentences with Ser

These examples reinforce the target verb across useful forms and contexts already taught in the lesson.

• Somos estudiantes. — We are students.
• Ella es de Colombia. — She is from Colombia.
• El libro es de Marta. — The book belongs to Marta.
• La reunión es en la sala tres. — The meeting is in room three.
• La puerta fue cerrada a las diez. — The door was closed at ten.
• Sé amable con los demás. — Be kind to others.

Regional and usage notes for Ser

The core tables retain tú, usted, vosotros/vosotras, and ustedes for project comparability. Voseo changes some second-person singular forms in regions where vos — “you, singular informal” — is used.

• Vos sos muy paciente. — You are very patient. (voseo)

Ser is one of Spanish’s most irregular verbs. Learn each high-frequency family independently: present soy / eres..., imperfect era..., preterite fui..., present subjunctive sea..., and past/future subjunctive fuera / fuere....