Ser Conjugation 101: Conjugate Ser In Spanish

Undoubtedly, ser is one of the most basic -ER verbs you’ll use in Spanish. However, this verb is irregular in the majority of tenses. So, to help you familiarize yourself, we’ll go over ser conjugation charts in this guide. Here’s a quick overview of what you’ll learn:

• Ser Overview
• Indicative Tenses of Ser Conjugations
  • Present tense
  • Preterite tense
  • Imperfect tense
  • Near Future tense
  • Future tense
  • Conditional tense
  • Present Perfect tense
  • Past Perfect tense
  • Future Perfect tense
  • Conditional Perfect tense
  • Progressive tenses
• Subjunctive Tenses of Ser Conjugations 
  • Present Subjunctive tense
  • Present Perfect Subjunctive tense
  • Imperfect Subjunctive tense
  • Past Perfect Subjunctive tense
• Imperative (Commands) of Ser Conjugations
  • Affirmative Commands
  • Negative Commands
• Uses & Examples
• Download Ser Conjugation Tables & Uses Cheat sheets
• Ser Conjugation Practice Quiz

Overview of Ser

Indicative Conjugations of Ser

Present tense

The present tense conjugations of ser are irregular for all subject pronouns. Use the stem ‘so’ to conjugate the forms ‘yo’, ‘nosotros’, ‘vosotros’, and the third person plural. ‘Tú’ and the third person singular do not use this stem. You can check the present forms of ser in the conjugation chart below.

Conjugate ser to the present tense to talk about family relationships, nationality, physical descriptions, profession, or to tell the time in the present. For instance: Ellas son mis primas.

Preterite tense

Ser preterite conjugation has two irregular patterns. The pronouns ‘yo’, ‘tú’, ‘nosotros’, and ‘vosotros’ use the irregular stem fui, while the third person singular and plural use fue. When conjugated to the preterite past tense, this verb can be used to describe how a person was at a specific moment in the past.

For example: ¿Por qué fuiste tan grosera con Rachel?

Imperfect tense

Ser conjugations are also irregular in the past imperfect tense. To form this tense, we must use the stem era for all subject pronouns. Use ser imperfect conjugations to describe how people or things used to be, tell the time in the past or to talk about past relationships or things you used to own.

For instance: Eran las 11 cuando Juan llegó.

Near future

The Spanish near future is formed with ir (present) + a + ser (infinitive). These conjugations are used to communicate what a person or thing is going to be in the future. This can include profession, family relationships, or personality traits. You can also use them to tell the time in the future.

For example: Julie y Aaron van a ser papás.

Future simple tense

Ser future conjugations are regular. You only must add the future endings as shown in the conjugation chart below. Conjugate ser to the future to communicate what people or things will be at some point in the future. Serás una excelente doctora.

Conditional tense

The conditional conjugations of ser are also regular. Use these ‘ser’ forms to communicate what people or things would be if a circumstance is met. For instance: Si viviera en la playa, Anna sería muy feliz.

Present perfect tense

Haber in the present tense + sido (past participle) is the formula to conjugate the present perfect in Spanish. These conjugations of ‘ser’ express what or how someone or something has or hasn’t been. For instance: Damian y Lucy han sido novios durante dos años.

Past perfect

Conjugate ser to the past perfect tense when you want to describe what or how someone had been before another action or point in the past. For example: Tom nunca había sido rechazado hasta este momento.

To conjugate to the past perfect, use the imperfect form of ‘haber’ and the past participle form of ‘ser’.

Future perfect

Ser conjugated to the future perfect tense describes how people or things will have been by or before a certain moment in the future. These conjugations of ‘ser’ are also used to talk about how someone might have been. For example: ¿Por qué habré sido tan impulsivo cuando era joven?

Conditional perfect

When conjugated to the Spanish conditional perfect tense, ser communicates how someone or something would have been if a past condition was met. For example: Michael nunca habría sido un buen escritor.

Progressive tenses

In Spanish, the progressive tenses of ser express how someone or something is being at the moment of speaking. This usually refers to behavior or personality traits. For instance: Ustedes están siendo muy groseros. The progressive tenses are formed with estar + siendo (present participle).

Ser Subjunctive Conjugations

In Spanish, the subjunctive mood is used to discuss wishes, requests, suggestions, expectations, doubts, or hypothetical situations. Below are ser conjugation charts for the most common subjunctive tenses. Be aware that, in this mood, ser is also irregular.

Present subjunctive

Ser subjunctive conjugations are formed with the stem se. Use the subjunctive forms of this verb to express requests, wishes, expectations, or suggestions related to a person or thing being a certain way. For example: Los papás de Julia quieren que sea doctora.

Present perfect subjunctive

Ser in the present subjunctive + sido is the structure we use to conjugate ‘ser’ to the present perfect subjunctive. We use these conjugations to wonder or wish that a person or thing has been a certain way. Espero que no hayan sido groseros con la señora.

Imperfect subjunctive

The imperfect subjunctive conjugations of ‘ser’ allow you to talk about past suggestions, requests, beliefs, or wishes someone had about a person or thing being a certain way. For example: No creí que fuera tan tarde.

The imperfect subjunctive has two conjugation models depending on the type of Spanish you use.

Latin American Spanish version

Note: Latin American Spanish doesn’t use the pronoun vosotros. As a result, this pronoun has been excluded from ser’s conjugation chart above.

Castilian Spanish version

Past perfect subjunctive

In the past perfect subjunctive, ser expresses how someone or something would have been if a past circumstance was met. You can also use these conjugations to express regret or hypothesize about how things or people would have been.

Here is an example: Creo que hubieras sido un excelente maestro.

Ser Imperative Conjugations

In Spanish, to command people to do something, we must use the imperative conjugations of a verb.

Affirmative commands

Ser affirmative command conjugations are formed with the stem se. Use these commands to order people to be a certain way or pursue a profession. For example: Sean buenos con su mamá.

Take Note: Notice that the affirmative command for ‘tú’ has an accent mark. This is done to distinguish this conjugation from the Spanish pronoun se.

Negative commands

If instead, you want to command people not to be a certain way, you must conjugate ser to the negative imperative. As shown in the conjugation chart below, these forms are the same as the present subjunctive.

Here is an example: ¡No seas ridícula!

Meanings of Ser & Examples

Now that you know how to conjugate ser in Spanish, you should check the following examples to have a better idea of the applications of this verb. Keep in mind that this guide focuses more on conjugation rather on how to use ser. 

In simple terms, we use ser to tell the time in Spanish, express possession or relationships and describe people or objects. These descriptions range from physical and personality traits to nationality and profession. 

[Ser conjugated] + [complement]

¿Qué hora era cuando Martha llegó?
What time was it when Martha arrived?

No sabía que este carro fuera tuyo.
I didn’t know that this car was yours.

Antonio y Anna han sido novios desde hace dos años.
Antonia and Anna have been dating for two years.

Download Ser Conjugation Tables & Uses Cheat sheets

Ser is one of the most important verbs and it’s an irregular -ER verb. It requires time to master and memorize all of its conjugations and uses. So, I’ve created a PDF you can download with all of ser’s conjugation charts and uses.

Download Conjugations PDF

Practice Quiz: Ser Conjugation

Now that you’ve learned how to conjugate ser in Spanish, you can put your knowledge to practice by taking the ser conjugation practice quiz.

Take Quiz