Preterite vs Imperfect in Spanish

In Brief

Use the preterite (pretérito indefinido) to present a past action as a complete event: Ayer compré un libro (“Yesterday I bought a book”). Use the imperfect (pretérito imperfecto) for habits, descriptions, background circumstances, or an action viewed as in progress: Cuando era niño, leía mucho (“When I was a child, I used to read a lot”). In stories, the imperfect often sets the scene and the preterite moves the events forward.

Overview

Spanish has more than one way to speak about the past. The preterite and imperfect can both refer to the same period, but they give the listener different views of an action. The preterite looks at an event as a complete whole, with its boundary included. The imperfect looks inside a past situation without focusing on its beginning or end.

This contrast becomes central around B1 because Spanish narratives regularly combine the two tenses. English sometimes makes a similar distinction with “did,” “was doing,” and “used to,” but there is no perfect one-to-one match. English simple past can translate either tense: “I lived in Madrid” may be Viví en Madrid if the stay is treated as a completed period, or Vivía en Madrid if it supplies the background to another event.

The choice is therefore not just about how long something lasted. A five-second action can be imperfect when viewed in progress, and a ten-year situation can be preterite when presented as a completed chapter. Ask how the speaker frames the past, not merely how much time passed.

How It Works

The core contrast: complete event or inside view

The relevant grammatical idea is aspect (the way a speaker presents the internal shape of an event). Both tenses locate something in the past; aspect tells us whether we see it as bounded and complete or as ongoing, repeated, descriptive, or otherwise open-ended from that past viewpoint.

Use the preterite when you present...	Use the imperfect when you present...
A completed event: Llegó a las ocho.	An action in progress: Dormía a las ocho.
A sequence of finished events: Entró, saludó y se sentó.	Background for a story: Hacía frío y llovía.
A completed period with boundaries: Viví allí tres años.	A past state or description: La casa era pequeña.
A change or beginning: De repente, empezó a llorar.	A repeated habit: Lloraba cada vez que se despedían.
A specific number of completed occurrences: Fui tres veces.	Indefinite repetition: Iba con frecuencia.

Preterite: events viewed as bounded

The preterite commonly answers “What happened?” It advances a narrative through completed steps:

Elena abrió la puerta, vio el paquete y llamó a su hermana.

The speaker presents each action as a whole. A precise completed time frame often supports this reading: ayer, el lunes, en 2024, durante dos horas, de 2018 a 2020, or tres veces. These expressions are clues, not automatic rules. What matters is that the event is treated as complete.

Regular preterite endings are:

Person	hablar	comer	vivir
yo	hablé	comí	viví
tú	hablaste	comiste	viviste
él/ella/usted	habló	comió	vivió
nosotros/as	hablamos	comimos	vivimos
vosotros/as	hablasteis	comisteis	vivisteis
ellos/ellas/ustedes	hablaron	comieron	vivieron

Frequent irregular forms include fui/fue (ir and ser), tuve (tener), estuve (estar), hice (hacer), dije (decir), pude (poder), quise (querer), and supe (saber).

Imperfect: habits, descriptions, and an inside view

The imperfect commonly answers “What was going on?” or “What were things like?” It is used for:

• repeated or habitual actions: Los domingos comíamos con mis abuelos;
• descriptions and states: La calle estaba vacía;
• age and time in the past: Tenía veinte años; Eran las nueve;
• weather as background: Hacía viento;
• an action in progress with no relevant endpoint: Trabajaba en casa;
• simultaneous ongoing actions: Mientras yo cocinaba, Ana ponía la mesa.

Regular imperfect endings are:

Person	hablar	comer	vivir
yo	hablaba	comía	vivía
tú	hablabas	comías	vivías
él/ella/usted	hablaba	comía	vivía
nosotros/as	hablábamos	comíamos	vivíamos
vosotros/as	hablabais	comíais	vivíais
ellos/ellas/ustedes	hablaban	comían	vivían

Only three verbs are irregular in the imperfect: ser (era...), ir (iba...), and ver (veía...).

Using both tenses in one scene

A common pattern is:

imperfect background or action in progress + preterite event

Leía cuando llamó. Here leía places us inside the reading; llamó introduces the complete event that occurred during it. This is sometimes described as an “interruption,” but the second event does not need to stop the first action. In Caminaba por el parque cuando vi a Marta, seeing Marta may not end the walk.

Another common pattern is description followed by consequence:

Estaba cansado, así que me fui. The imperfect gives the state; the preterite gives the completed decision or action that follows.

Time expressions are clues, not commands

Certain expressions often occur with one tense:

Often favors preterite	Often favors imperfect
ayer, anoche, una vez	antes, de niño/a, normalmente
de repente, entonces	siempre, a menudo, todos los días
durante dos años, tres veces	mientras, cada verano, por lo general

But context can override the tendency. Siempre may accompany the preterite when a speaker sums up a completed relationship: Durante aquellos años, siempre me ayudó. Likewise, ayer can contain an action viewed in progress: Ayer a las ocho trabajaba.

Examples in Context

Spanish	English	Note
Llovía cuando salí.	It was raining when I left.	Background weather + completed departure
Antes fumaba. Dejé de fumar hace cinco años.	I used to smoke. I quit five years ago.	Former habit + completed change
Leía cuando llamó.	I was reading when he called.	Ongoing action + completed event
Estaba cansado, así que me fui.	I was tired, so I left.	Past state + completed consequence
De niña, visitaba a mis primos cada verano.	As a child, I used to visit my cousins every summer.	Repeated childhood habit
El verano pasado visité a mis primos tres veces.	Last summer I visited my cousins three times.	Counted, completed visits
La cafetería era pequeña y tenía mesas de madera.	The café was small and had wooden tables.	Description of a past setting
Entramos, pedimos dos cafés y nos sentamos junto a la ventana.	We went in, ordered two coffees, and sat by the window.	Sequence of completed events
Mientras Marta preparaba la cena, yo lavaba los platos.	While Marta was making dinner, I was washing the dishes.	Two simultaneous ongoing actions
Vivía en Sevilla cuando conocí a Lucía.	I was living in Seville when I met Lucía.	Background situation + event
Viví en Sevilla de 2019 a 2022.	I lived in Seville from 2019 to 2022.	Completed, bounded period
A las diez todavía trabajábamos, pero a las once terminamos.	At ten we were still working, but at eleven we finished.	Inside view + endpoint
Cada vez que sonaba el teléfono, el perro ladraba.	Every time the phone rang, the dog would bark.	Repeated paired events viewed as a pattern
Sonó el teléfono y el perro ladró dos veces.	The phone rang, and the dog barked twice.	Specific completed events

Common Mistakes

Treating every long action as imperfect

• Wrong: Vivía en Chile durante diez años. (when the ten-year stay is a completed chapter)
• Right: Viví en Chile durante diez años.
• Why: Duration does not determine the tense. Durante diez años gives the period a completed boundary, so the preterite is natural in this context.

Using the preterite for all past descriptions

• Wrong: La casa fue grande y tuvo un jardín. (when setting a scene)
• Right: La casa era grande y tenía un jardín.
• Why: Size and possession describe what the house was like. The imperfect supplies background rather than reporting changes or completed events.

Translating English simple past mechanically

• Wrong approach: assuming “I worked” must always be trabajé.
• Right: Trabajé allí seis meses for a completed job period; Trabajaba allí cuando empezó la huelga for background.
• Why: English simple past leaves some aspectual choices unstated. Spanish requires you to choose a viewpoint.

Assuming cuando always triggers the preterite

• Wrong: Cuando era niño, jugué fuera todos los días. (for a general childhood habit)
• Right: Cuando era niño, jugaba fuera todos los días.
• Why: Cuando means “when,” but it does not select the tense. Both the childhood state and repeated playing are habitual background here.

Using two imperfects for a single event in progress and a new event

• Wrong: Dormía cuando llegaba el paquete. (if one particular package arrived)
• Right: Dormía cuando llegó el paquete.
• Why: The sleeping is viewed from inside; the package’s arrival is one completed event. The original sentence can be correct only with a repeated meaning, such as “I would be sleeping whenever the package arrived.”

Usage Notes

In Spain, pretérito indefinido is the usual teaching name for forms such as hablé and comí. You may also see pretérito perfecto simple. In much of Latin America, teachers commonly call it pretérito or pretérito simple. These names refer to the same tense.

The contrast discussed here is not the entire Spanish past-tense system. Spanish also has the present perfect (he hablado). Its distribution varies by region: in much of Spain it is common for events connected to the current period (Hoy he hablado con Ana), while many Latin American varieties readily use the preterite (Hoy hablé con Ana). That regional choice does not remove the preterite–imperfect distinction.

Narrative style also affects frequency. A speaker recounting events usually uses preterites for the main timeline and imperfects for setting, habits, motives, and actions already under way. Real narratives are more flexible than a simple “background versus event” formula, however: speakers can switch viewpoint to zoom in, summarize, or portray repetition.

Beyond the Basics / Advanced Use

The same verb can change meaning with the viewpoint

With verbs describing knowledge, ability, intention, or states, the tense contrast can create an English translation that looks like a change in meaning:

Imperfect	Typical meaning	Preterite	Typical meaning
conocía a Pablo	I knew Pablo	conocí a Pablo	I met Pablo
sabía la verdad	I knew the truth	supe la verdad	I found out the truth
podía entrar	I was able/allowed to enter	pude entrar	I managed to enter
no podía entrar	I could not enter / was unable in general	no pude entrar	I failed to get in
quería hablar	I wanted to talk	quise hablar	I tried/decided to talk, or wanted to at that point
no quería ir	I did not want to go	no quise ir	I refused to go

These are not arbitrary dictionary meanings. The preterite often adds an event boundary: coming to know, exercising an ability successfully, or acting on a wish. Context still matters, so treat these as strong tendencies rather than mechanical translations.

Era and fue are both possible

Descriptions do not automatically require era. Compare:

• La reunión era aburrida cuando salí. — The meeting was boring at the point when I left; this describes the scene.
• La reunión fue aburrida. — The speaker evaluates the meeting as a completed whole.

Similarly, Fue profesor durante treinta años presents an entire completed career, while Era profesor cuando lo conocí gives someone’s occupation as background.

Repetition can take either tense

The imperfect presents repeated events as a habit or open pattern: Los sábados íbamos al mercado. The preterite counts or summarizes repetition inside a completed frame: Ese mes fuimos al mercado cuatro veces. Even siempre can occur with a preterite when an entire finished period is evaluated: Mi abuela siempre me apoyó.

Narrative viewpoint can be stylistic

Writers sometimes use the imperfect to place the reader inside a developing scene, even when the events could logically be seen as complete. Sports commentary, dreams, recollections, and literary narration may exploit this “camera inside the action” effect. At an advanced level, the best question is not “Which tense is objectively true?” but “How does the speaker want the listener to experience this event?”

Practice Tips

1. Build two versions of one memory. First write a setting with imperfect forms: where you were, what the weather was like, and what people were doing. Then add three preterite events that move the story forward.
2. Sort by viewpoint, not by verb. Take ten past-tense sentences and label each form “completed event,” “habit,” “description,” “ongoing action,” or “completed period.” The same verb should appear in both columns.
3. Retell short stories aloud. Listen for scene-setting forms such as era, estaba, había, and hacía, then for event forms such as llegó, vio, and decidió. Retell the story while preserving that division.

Related Concepts

• Prerequisite: Imperfect Tense — review imperfect formation and its basic uses before focusing on the contrast with the preterite.