ser
To be (expressing permanent or inherent qualities, identity, origin, and essence)
Definitions
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1
To be (identity or nature) — used to describe who or what someone/something fundamentally is
“Mi hermana es una doctora muy dedicada.”
My sister is a very dedicated doctor.
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2
To be (origin or nationality) — used to say where someone or something comes from
“Los estudiantes nuevos son de México.”
The new students are from Mexico.
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3
To be (permanent or inherent characteristic) — used to describe lasting traits like color, material, or personality
“La mesa nueva es de madera y es bastante grande.”
The new table is made of wood and is quite large.
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4
To be (time, dates, and events) — used to express time, days, and where events take place
“La fiesta de cumpleaños es el sábado por la tarde.”
The birthday party is on Saturday afternoon.
Conjugation
Present (Presente)
| yo | soy |
| tú | eres |
| él/ella/usted | es |
| nosotros | somos |
| vosotros | sois |
| ellos/ellas/ustedes | son |
Preterite / Simple Past (Pretérito indefinido)
| yo | fui |
| tú | fuiste |
| él/ella/usted | fue |
| nosotros | fuimos |
| vosotros | fuisteis |
| ellos/ellas/ustedes | fueron |
Imperfect Past (Pretérito imperfecto)
| yo | era |
| tú | eras |
| él/ella/usted | era |
| nosotros | éramos |
| vosotros | erais |
| ellos/ellas/ustedes | eran |
Future (Futuro simple)
| yo | seré |
| tú | serás |
| él/ella/usted | será |
| nosotros | seremos |
| vosotros | seréis |
| ellos/ellas/ustedes | serán |
Present Perfect (Pretérito perfecto compuesto)
| yo | he sido |
| tú | has sido |
| él/ella/usted | ha sido |
| nosotros | hemos sido |
| vosotros | habéis sido |
| ellos/ellas/ustedes | han sido |
Spanish has TWO verbs meaning "to be": **ser** and **estar**. Use **ser** for permanent or inherent qualities (identity, nationality, material, time/dates). Use **estar** for temporary states, location, and feelings. Mixing them up is one of the most common mistakes for English speakers — mastering this distinction is essential!