Preterite vs Imperfect in Spanish: When to Use Each + Quiz

Spanish has two simple past tenses, and choosing between them is the classic stumbling block for learners: the preterite (pretérito indefinido) and the imperfect (pretérito imperfecto). English often uses one form for both (I ate, I was), so the rule has to come from meaning, not from translation.

The short answer:

• Preterite = what happened. A finished event, like a photo: Ayer llamé a mi madre (Yesterday I called my mother).
• Imperfect = how it was or what used to happen. The background, like a video: Hacía sol y los pájaros cantaban (It was sunny and the birds were singing).

Preterite vs imperfect practice: quick quiz

When to use the preterite (indefinido)

Use the preterite for actions you see as complete: they started and ended in the past, and the speaker treats them as a single event.

1. A finished action at a specific time. El martes visité a mis tíos. (On Tuesday I visited my aunt and uncle.)
2. A sequence of events. Llegó a casa, se quitó los zapatos y encendió la tele. (She got home, took off her shoes and turned on the TV.)
3. A sudden action that interrupts. Dormíamos cuando sonó la alarma. (We were sleeping when the alarm went off.)
4. A closed period of time, even a long one. Estudié en Salamanca cuatro años. (I studied in Salamanca for four years.)
5. A counted number of times. Vimos esa película dos veces. (We saw that movie twice.)

When to use the imperfect (imperfecto)

Use the imperfect when the action is not framed as finished: you describe it from the inside, as a habit, a state or something in progress.

1. Habits and repeated actions (English "used to" / "would"). En verano nos bañábamos en el río. (In summer we used to swim in the river.)
2. Descriptions of people, places, weather and feelings. El pueblo era pequeño y tranquilo. (The village was small and quiet.)
3. An action in progress when something else happened. Cruzaba la calle cuando me llamaste. (I was crossing the street when you called me.)
4. Two actions going on at the same time. Mientras yo planchaba, él fregaba los platos. (While I was ironing, he was washing the dishes.)
5. Time and age in the past. Era medianoche. Mi abuelo tenía ochenta años. (It was midnight. My grandfather was eighty.)

Signal words: preterite or imperfect?

Time expressions are the fastest clue. They are not absolute rules, but in 9 cases out of 10 they point to the right tense.

Both tenses in one sentence: background and event

The most useful pattern to learn: imperfect for the scene, preterite for what happens in it. Think of the imperfect as a film that is playing and the preterite as the moment someone presses pause.

• Llovía (background) cuando salimos del cine (event). (It was raining when we came out of the movie theater.)
• Mientras hablaba por teléfono (background), se quemó la cena (event). (While I was on the phone, dinner burned.)
• Eran las siete y todavía no había nadie en la oficina (scene). Entonces llegó el jefe (event).

Verbs that change meaning

A few verbs shift meaning between the two tenses. This is where translation helps most:

Common mistakes English speakers make

• "Was" is not automatically imperfect. The concert was great as a verdict on a finished event is El concierto fue genial.
• "Used to" and "would" (habits) are always imperfect. We would go to the beach every summer = Íbamos a la playa cada verano.
• A long duration does not make it imperfect. If the period is closed (for ten years, all day), use the preterite: Viví diez años en Lima.
• "Was/were + -ing" is a strong hint for the imperfect: I was cooking = Cocinaba (or Estaba cocinando).

A short story with both tenses

Era un sábado de agosto y hacía muchísimo calor. Mis amigos y yo estábamos en la terraza y tomábamos limonada. De repente, empezó a soplar el viento, el cielo se puso negro y cayó una tormenta enorme. Recogimos todo en dos minutos y entramos corriendo en casa.

The imperfect forms (era, hacía, estábamos, tomábamos) paint the scene. The preterite forms (empezó, se puso, cayó, recogimos, entramos) are the events that move the story forward.

Endings at a glance

The imperfect has only three irregular verbs (ser, ir, ver), while the preterite has many (tener → tuve, hacer → hice, ir/ser → fui). Full tables: Spanish preterite and Spanish imperfect.