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Ser Preterite Practice

Ser (to be (essence)) in the preterite: 14 free exercises with an explanation after every answer, plus the full conjugation table.

14 exercisesIrregularA1 – A2 level
IWhat to watch for

In the preterite, ser abandons its stem completely: fui, fuiste, fue, fuimos, fuisteis, fueron. These forms are identical to those of ir — only context tells you whether someone 'was' or 'went'. Use them when a state or role is viewed as a closed, completed chapter.

The classic trap is writing accents that do not exist: it is fui and fue, never 'fuí' or 'fué'. The second trap is choosing fue when the sentence describes an ongoing background state, which needs the imperfect era instead.

IIConjugation
serPreterite
yo
fui
fuiste
él / ella / usted
fue
nosotros
fuimos
vosotros
fuisteis
ellos / ustedes
fueron
Fully irregular in the present, preterite, and imperfect — the forms have to be memorized.
IIIPractice exercises

Practice.

Answer first, then read the explanation. Don't skip it — that's the whole point.

Exercise 01 of 14Tag: Completed role
Fill in the blank

El año pasado yo _____ el encargado de organizar la posada. (ser)

Last year I was the one in charge of organizing the holiday party.

Exercise 02 of 14Tag: No accent on fue
Fill in the blank

La boda de Lucía _____ en una hacienda cerca de Cuernavaca. (ser)

Lucía's wedding was at a hacienda near Cuernavaca.

Exercise 03 of 14Tag: Tú form
Fill in the blank

¿Tú _____ la primera de tu familia en ir a la universidad? (ser)

Were you the first in your family to go to college?

Exercise 04 of 14Tag: Historical fact
Fill in the blank

Los aztecas _____ grandes constructores de templos y ciudades. (ser)

The Aztecs were great builders of temples and cities.

Exercise 05 of 14Tag: Nosotros form
Fill in the blank

Mi hermano y yo _____ campeones del torneo escolar en 2019. (ser)

My brother and I were champions of the school tournament in 2019.

Exercise 06 of 14Tag: One-time event
Fill in the blank

El terremoto de 1985 _____ una tragedia para la Ciudad de México. (ser)

The 1985 earthquake was a tragedy for Mexico City.

Exercise 07 of 14Tag: Closed period
Fill in the blank

Yo _____ mesera en ese café durante dos veranos. (ser)

I was a waitress at that café for two summers.

Exercise 08 of 14Tag: Ellos form
Fill in the blank

Las entradas _____ un regalo de mi cuñado por mi cumpleaños. (ser)

The tickets were a gift from my brother-in-law for my birthday.

Exercise 09 of 14Tag: Completed event
Fill in the blank

Anoche tú _____ el único que llegó puntual a la cena. (ser)

Last night you were the only one who arrived on time for dinner.

Exercise 10 of 14Tag: No accent on fue
Fill in the blank

Su primera película _____ un fracaso total en la taquilla. (ser)

His first movie was a total failure at the box office.

Exercise 11 of 14Tag: Nosotros form
Fill in the blank

Aquella tarde nosotros _____ los últimos en salir del estadio. (ser)

That afternoon we were the last ones to leave the stadium.

Exercise 12 of 14Tag: No accent on fui
Fill in the blank

En 2020 yo _____ voluntario en un hospital de Bogotá. (ser)

In 2020 I was a volunteer at a hospital in Bogotá.

Exercise 13 of 14Tag: Period viewed whole
Fill in the blank

Aquellos meses _____ los más difíciles de nuestra mudanza. (ser)

Those months were the hardest of our move.

Exercise 14 of 14Tag: Tense contrast
Fill in the blank

_____ mi mejor maestra el semestre pasado. (ser)

You were my best teacher last semester.

Every answer is explained

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