ser Affirmative Imperative Conjugation
ser — to be
The affirmative imperative of ser is used for commands: sé, sea, seamos, sed, sean.
ser Affirmative Imperative Forms
When to Use the Affirmative Imperative
Use this to tell someone to 'be' something, like 'be brave' or 'be quiet'.
Notes on ser in the Affirmative Imperative
The 'tú' form is 'sé' (with an accent), which is unique and easily confused with other words.
Example Sentences
¡Sé valiente!
Be brave!
tú
Sea paciente, por favor.
Be patient, please.
Sed buenos niños.
Be good children.
vosotros
Common Mistakes
Mistake: Writing 'se' instead of 'sé'.
Correct: The command 'be' always has an accent: sé.
Why: 'Se' without an accent is a pronoun (like 'se lo di'), while 'sé' is the command 'be' or 'I know'.
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Related Tenses
Present
yo: soy
The present of ser is highly irregular and essential: soy, eres, es, somos, sois, son.
Preterite
yo: fui
The preterite of ser shares the exact same forms as the verb 'ir' (to go): fui, fuiste, fue, fuimos, fuisteis, fueron.
Imperfect
yo: era
The imperfect of ser is one of only three irregular verbs in this tense: era, eras, era, éramos, erais, eran.
Future
yo: seré
The future of ser is regular: seré, serás, será, seremos, seréis, serán.
Conditional
yo: sería
The conditional of ser is regular: sería, serías, sería, seríamos, seríais, serían.
Present Subjunctive
yo: sea
The present subjunctive of ser is irregular: sea, seas, sea, seamos, seáis, sean.
Imperfect Subjunctive
yo: fuera
The imperfect subjunctive of ser uses the 'fuer-' stem: fuera, fueras, fuera, fuéramos, fuerais, fueran.
Negative Imperative
yo: no seas
The negative imperative of ser uses 'no' + present subjunctive: no seas, no sea, no seamos, no seáis, no sean.