A2.12 - My time at school

The imperfect tense or the simple past?

¿El pretérito imperfecto o el pretérito indefinido?

Explicación breve sobre la direfencia entre el pretérito imperfecto y el pretérito indefinido.

(Brief explanation of the difference between the pretérito imperfecto and the pretérito indefinido.)

Two past tenses: what’s the real difference?

Pretérito indefinido = the event is “boxed”: it happened and finished.

Pretérito imperfecto = the past is “open”: background, routine, description, in-progress.

Think in English Spanish tense Typical use
I did / I went / I finished Indefinido Completed action, specific event, result
I was doing / I used to / it was Imperfecto Background, habit, ongoing action, description

A fast decision tool (ask yourself 3 questions)

  1. Is it a completed event? (one thing that happened) → indefinido

    Aprobé el máster en 2022.

  2. Is it a habit / routine / “used to”? → imperfecto

    En Madrid enseñaba en una escuela primaria.

  3. Is it describing the scene? (how someone/something “was”) → imperfecto

    La escuela era antigua y tenía un patio grande.

Typical time expressions that “push” you to one tense

Often with indefinido (closed time) Often with imperfecto (open time)
  • ayer, anoche
  • en 2022, el lunes pasado
  • una vez, de repente
  • siempre, a menudo, normalmente
  • antes, de niño/a, cuando era...
  • mientras (for the action in progress)

Note: these words are strong clues, not automatic rules. Meaning still matters.

Imperfecto + indefinido in the same story (the most common pattern)

Use imperfecto to set the scene (what was going on) and indefinido for the interrupting event (what happened).

  • Mientras volvíamos de clase, mi madre nos llamó.

    Background: volvíamos (ongoing) + Event: llamó (punctual)

  • Mientras dábamos clase, el director entró en el aula.

Common learner mistakes (and how to fix them)

  • Habit vs. one-time event

    Ayer iba al curso. → Ayer fui al curso. (specific day = event)

    Cuando era niño, fui al colegio todos los días. → Cuando era niño, iba al colegio todos los días. (routine)

  • Description vs. change

    La escuela era antigua. (description/background)

    La escuela fue famosa ese año. (more like: “it became/was (as a fact) that year”)

  • With “mientras”, don’t use indefinido for the ongoing action

    Mientras vinimos de clase, mi madre nos llamó. → Mientras veníamos de clase, mi madre nos llamó.

Self-check: choose the tense before you conjugate

  1. Underline the verb. Decide: scene or event?

  2. Add a label: habit / description / in progress → imperfecto.

  3. Add a label: finished / one time / specific moment → indefinido.

Goal: in conversation, use imperfecto to paint the background, then switch to indefinido to report what happened.

Tiempo verbal (Verb tense)Regla (Rule)Ejemplo (Example)
Pretérito IndefinidoEvento en el pasado (Event in the past)Aprobé el máster en 2022 (I passed my master’s in 2022)
Pretérito IndefinidoUna acción que pasó y terminó en el pasado (An action that happened and ended in the past)El profesor suspendió la clase por la lluvia (The teacher canceled the class because of the rain)
Pretérito ImperfectoAcción habitual o repetida en el pasado (Habitual or repeated action in the past)En Madrid enseñaba en la escuela primaria (In Madrid I taught at a primary school)
Pretérito ImperfectoDescripción en el pasado (Description in the past)La escuela era antigua y tenía un patio grande (The school was old and had a big playground)
Pretérito Imperfecto + Pretérito IndefinidoEl imperfecto describe la situación, y el indefinido dice qué pasó (The imperfect describes the situation, and the preterite says what happened)Mientras volvíamos de clase, mi madre nos llamó  (While we were coming back from class, my mother called us )

 

Exceptions!

  1. Both tenses can appear in the same narration.

Exercise 1: Multiple choice

Instruction: Choose the correct answer

1. Cuando era niño, siempre ______ buenas notas en matemáticas.

When I was a child, I always ______ good grades in mathematics.

2. Ayer me ______ en un curso de bachillerato para adultos.

Yesterday I ______ in a high school course for adults.

3. La escuela primaria ______ antigua y tenía un patio grande.

The primary school ______ old and had a big playground.

4. Mientras dábamos clase, el director ______ en el aula y habló con el profesor.

While we were teaching, the principal ______ the classroom and spoke with the teacher.

Exercise 2: Multiple Choice

Instruction: Choose the correct sentence (preterite imperfect or preterite indefinite).

1.
«Ayer» marks a specific moment in the past; with reference to a specific day, the indefinite would be used, not the imperfect.
«Fui» indicates a specific or finished action; it is not suitable for frequent habits in the past.
2.
With «last year» which delimits the period, the indefinite is normally used if the action is considered finished, not the imperfect.
«Estudio» is in the present and does not match «last year» (past time).

Exercise 3: Rewrite the phrases

Instruction: Rewrite the sentences by changing the verbs to the correct tense: use the simple past (pretérito indefinido) for completed actions and the imperfect past (pretérito imperfecto) for descriptions or habits (example: Antes estudiaba mucho, pero ayer estudié poco).

Show/Hide translation Show/Hide hints
  1. En 2022 yo (aprobar) el máster y (empezar) a trabajar en una empresa.
    ⇒ ______________________________________________________________________________________________________________ Example
    En 2022 yo aprobé el máster y empecé a trabajar en una empresa.
    (In 2022 I passed my master’s degree and started working at a company.)
  2. Cuando era niño, siempre (ir) a la escuela a pie y (jugar) en el patio.
    ⇒ ______________________________________________________________________________________________________________ Example
    Cuando era niño, siempre iba a la escuela a pie y jugaba en el patio.
    (When I was a child, I always went to school on foot and played in the schoolyard.)
  3. La escuela (ser) antigua y (tener) un patio grande.
    ⇒ ______________________________________________________________________________________________________________ Example
    La escuela era antigua y tenía un patio grande.
    (The school was old and had a big schoolyard.)
  4. Mientras (venir) de clase, mi madre me (llamar).
    ⇒ ______________________________________________________________________________________________________________ Example
    Mientras veníamos de clase, mi madre me llamó.
    (While we were coming home from class, my mother called me.)

Exercise 4: Grammar in action

Instruction: In pairs, recount school memories and ask for specific details.

Show/Hide translation
Situation
En una comida con colegas, comentas recuerdos de tu época escolar.
(At a meal with colleagues, you talk about memories from your school days.)
Discuss
  • ¿Cómo era tu escuela primaria o tu colegio cuando eras niño/a? (What was your primary school or your school like when you were a child?)
  • ¿Qué hacíais normalmente en el aula y con vuestros compañeros? ¿Por qué? (hábitos) ¿Cuéntame un día especial que recuerdas, qué pasó exactamente? (What did you usually do in the classroom and with your classmates? Why? (habits) Tell me about a special day you remember, what exactly happened?)
Useful words and phrases
  • En los años... mi colegio era... (In the years... my school was...)
  • Siempre sacaba buenas notas, pero una vez saqué malas notas. (I always got good grades, but one time I got bad grades.)
  • Me acuerdo de cuando dábamos clase y entonces pasó algo interesante. (I remember when we were in class and then something interesting happened.)
Use in conversation
  • pretérito imperfecto para describir y hablar de hábitos (preterite imperfect to describe and talk about habits)
  • pretérito indefinido para acciones terminadas y eventos concretos (preterite indefinite for completed actions and specific events)
  • imperfecto + indefinido para contexto y acción (mientras...) (imperfect + indefinite for context and action (while...))

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