Preterite vs Imperfect in Spanish: When to Use Each (with Examples)

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The Spanish preterite and imperfect both describe the past, but they present past situations differently. Choosing between them becomes easier when you ask whether you are advancing the story or describing its background.

The key distinction is aspect: how the speaker presents the past situation. Is it viewed as a bounded event, or as an ongoing, habitual or descriptive background?

This guide uses a photograph-and-film metaphor, followed by common time expressions, conjugation tables and verbs whose usual English translation can shift with the tense and context.

The Core Idea: Photographs vs the Film

Use this as a starting metaphor, not as an iron rule.

The preterite is a photograph. The imperfect is the film rolling in the background.

A photograph captures one moment, snapped, done, framed. That's the preterite: a completed action with a clear edge to it. Something happened, it finished, the story moved forward a step.

The imperfect is the film playing behind the photos: the scenery, the weather, the mood, the things that were simply going on without a clear start or stop. It sets the scene the photographs are taken against.

Picture telling a story about last night:

Llovía y la calle estaba vacía cuando de repente vi a mi amigo y lo saludé.
It was raining and the street was empty when suddenly I saw my friend and said hi to him.

The rain and the empty street are the film, the backdrop rolling along (imperfect: llovía, estaba). Seeing your friend and saying hi are the snapshots, the events that moved the story forward (preterite: vi, saludé). Same past, two jobs.

As a quick memory aid: preterite = photographs, imperfect = the film. Context can make the contrast more nuanced.

When to reach for the preterite

Use the preterite for completed, bounded actions, the snapshots that push your story along:

• Single finished events: Ayer comí pizza. (Yesterday I ate pizza.)
• Actions with a clear beginning or end: La película empezó a las ocho. (The film started at eight.)
• A sequence of events, one after another: Entré, me senté y pedí un café. (I came in, sat down and ordered a coffee.)
• Something that happened a set number of times: Fui a México tres veces. (I went to Mexico three times.)

When to reach for the imperfect

Use the imperfect for the rolling background, the film behind the photos:

• Ongoing actions with no clear edge: Leía un libro. (I was reading a book.)
• Habits and repeated actions: Todos los veranos íbamos a la playa. (Every summer we went to the beach.)
• Descriptions and setting the scene: La casa era grande y vieja. (The house was big and old.)
• Time, age and weather: Eran las tres. Tenía diez años. Hacía frío. (It was three o'clock. I was ten. It was cold.)
• Mental and emotional states: Estaba cansado y quería dormir. (I was tired and wanted to sleep.)

A quick gut-check you can run in your head: could you film it rolling on (imperfect), or did it just happen (preterite)? Description and “was -ing” point you to the imperfect. A clean, finished event points you to the preterite.

This contrast may remind you of ser vs estar, two Spanish verbs that English often translates as “to be”. In both cases, a single English translation can conceal a distinction expressed in Spanish.

Trigger Words: Your Shortcut to the Right Tense

Certain time expressions often appear with one tense. Spanish teachers sometimes call them trigger words, but they are clues rather than rules.

Use them as signposts, then check what the sentence means in context.

Preterite trigger words

These point at a specific, finished moment, so they pull the preterite:

Spanish	English
ayer	yesterday
anoche	last night
anteayer	the day before yesterday
de repente	suddenly
una vez	once
el lunes pasado	last Monday
la semana pasada	last week
el año pasado	last year
hace dos días	two days ago
el mes pasado	last month

Imperfect trigger words

These point at the habitual, the ongoing, the “back then”, so they pull the imperfect:

Spanish	English
siempre	always
todos los días	every day
todas las semanas	every week
generalmente	generally
a menudo	often
a veces	sometimes
mientras	while
de niño / de niña	as a child
en aquella época	back in those days
normalmente	usually

Notice the pattern. Preterite triggers nail things down to a point (ayer, de repente, una vez). Imperfect triggers spread things out across time (siempre, todos los días, de niño). That's the photograph-vs-film distinction showing up at the level of single words.

A Quick Conjugation Refresher

Here are the regular endings and the most useful irregular forms.

Regular preterite endings

	-ar (hablar)	-er (comer)	-ir (vivir)
yo	hablé	comí	viví
tú	hablaste	comiste	viviste
él/ella/usted	habló	comió	vivió
nosotros	hablamos	comimos	vivimos
vosotros	hablasteis	comisteis	vivisteis
ellos/ustedes	hablaron	comieron	vivieron

Note that -er and -ir verbs share the same preterite endings, which cuts your work in half. Watch those accents on hablé, habló, comí, comió: they carry the stress and they change the meaning.

Regular imperfect endings

The imperfect is the kinder of the two. The endings are wonderfully regular, and -er and -ir verbs again share one set:

	-ar (hablar)	-er (comer)	-ir (vivir)
yo	hablaba	comía	vivía
tú	hablabas	comías	vivías
él/ella/usted	hablaba	comía	vivía
nosotros	hablábamos	comíamos	vivíamos
vosotros	hablabais	comíais	vivíais
ellos/ustedes	hablaban	comían	vivían

The irregulars worth knowing

The preterite has several irregulars. Here are four common ones, with the first-person singular and the full set:

Verb	Preterite (yo)	Full set
ser / ir	fui	fui, fuiste, fue, fuimos, fuisteis, fueron
hacer	hice	hice, hiciste, hizo, hicimos, hicisteis, hicieron
tener	tuve	tuve, tuviste, tuvo, tuvimos, tuvisteis, tuvieron
estar	estuve	estuve, estuviste, estuvo, estuvimos, estuvisteis, estuvieron

Ser and ir have identical preterite forms (fui can mean “I was” or “I went”). The surrounding words normally make the intended verb clear.

In the standard imperfect indicative, ser, ir and ver are the three irregular verbs:

Verb	Imperfect
ser	era, eras, era, éramos, erais, eran
ir	iba, ibas, iba, íbamos, ibais, iban
ver	veía, veías, veía, veíamos, veíais, veían

The High-Value Bit: Verbs That Change Meaning

Some common verbs deserve extra attention because their usual English translation can change with the tense.

With several common verbs, aspect and context often lead to a different English translation. The imperfect commonly presents an ongoing state, while the preterite can present an event or a bounded attempt. These are common readings, not automatic one-word substitutions.

Start with these four:

Verb	Imperfect (a common reading)	Preterite (a common reading)
conocer	conocía: I knew (a person)	conocí: I met / became acquainted with
saber	sabía: I knew (a fact)	supe: I found out / I realised
querer	quería: I wanted to	quise: I wanted to / tried to in some contexts (and no quise often means I refused)
poder	podía: I was able to / could	pude: I was able to / managed to in some contexts (and no pude often means I could not or failed to)

Look at how much the tense alone changes:

Yo conocía a María: I knew María. (We were already acquainted, an ongoing state.) Yo conocí a María: I met María. (The single moment we first met.)

Yo sabía la verdad: I knew the truth. (I already held that knowledge.) Yo supe la verdad: I found out the truth. (The instant it landed.)

Quería ayudar: I wanted to help. (A standing intention.) Quise ayudar: I tried to help. (I made the actual attempt.)

Podía correr diez kilómetros: I could run ten kilometres. (I had the ability, generally.) Pude correr diez kilómetros: I managed to run ten kilometres. (I pulled it off that one time.)

These contrasts help explain why conocía can mean “I knew her” while conocí can mean “I met her”. Always read the tense together with the rest of the sentence.

Putting It Together: Practice Sentences

Here's how the two tenses interlock in a real story. The imperfect paints the scene; the preterite drops the events in:

Era una noche tranquila. Llovía y yo leía un libro cuando, de repente, sonó el teléfono. Contesté y escuché la voz de mi madre.
It was a quiet night. It was raining and I was reading a book when, suddenly, the phone rang. I answered and heard my mother's voice.

See the rhythm? Era, llovía, leía are the film rolling on (the night, the rain, the reading). Sonó, contesté, escuché are the photographs, the snap events that move things forward.

Now try a few yourself. Pick preterite or imperfect for the verb in brackets, then check below:

1. Cuando yo (ser) niño, (jugar) al fútbol todos los días.
2. Ayer mi hermana (llegar) tarde a la fiesta.
3. (Hacer) sol y nosotros (caminar) por el parque cuando (empezar) a llover.
4. Yo no (conocer) a tu primo hasta que lo (conocer) en tu boda.

Answers:

1. era / jugaba: both imperfect (a description and a daily habit, all film).
2. llegó: preterite (one finished event with ayer doing the triggering).
3. Hacía / caminábamos / empezó: imperfect for the weather and the ongoing stroll, preterite for the sudden event that interrupts them.
4. conocía / conocí: the meaning-changing verb in action: I didn't know him (imperfect, ongoing state) until I met him (preterite, the single moment).

Number 4 brings the central distinction together: an ongoing state in the imperfect followed by a bounded event in the preterite.

Where to Go From Here

The rules and metaphor can get you started. Telling stories aloud, noticing the contrast in input and getting feedback can make the choice more automatic over time.

So keep building. Brush up on the ser vs estar distinction (its sister puzzle), get your punctuation right with the upside-down question mark and the Spanish question mark more broadly, and shore up your everyday vocabulary with the months of the year in Spanish (handy, given how often dates trigger the preterite).

And if you want a structured way to go from grammar tables to actually holding a conversation, that's exactly what we do inside the Fluent in 3 Months Bootcamp. It's a cohort-based programme where I and the team coach you to speak Spanish with real people from early on, the kind of real-world practice that turns “preterite vs imperfect” from a thing you think about into a thing you just do.

For now, you've got the metaphor, the trigger words, the conjugations and those tricky meaning-changing verbs. Go and tell a story in the past. Both kinds.