Grammarpillar page
Preterite vs Imperfect
Spanish has two simple past tenses, and every story you read uses both on every page. The choice is not about how long something lasted — it's about what the sentence is doing. The preterite reports events; the imperfect paints the scene they happen in. One example shows both: Dormía cuando sonó el teléfono — “I was sleeping when the phone rang.” Dormía (imperfect) is the ongoing background; sonó (preterite) is the event that broke in.
The one rule: plot vs scene
Think of a story as a movie. The preterite is the plot — the actions that advance the story, each one complete and dated. The imperfect is the camera setting — what the weather was like, what people looked like, what was going on, what used to happen there. English forces “I went / I was going” to carry this alone; Spanish marks the difference on every verb.
Preterite = the plot
A finished event with edges — it started and it ended. Ayer fui al mercado.Yesterday I went to the market. (Done. A point on the timeline.)
Imperfect = the scene
The background it happened against — no edges, just ongoing reality. Iba al mercado los domingos.I used to go to the market on Sundays. (A habit, not an event.)
Same verb, same person, two different pasts: fui closes the action,iba opens a window onto how things were. Almost every preterite/imperfect decision falls out of this one contrast.
When to use the preterite
Reach for the preterite when the sentence reports something that happened and finished:
- A single completed actionTerminé la tarea.I finished the homework.
- A chain of events, in sequenceMe levanté, me duché y salí.I got up, showered, and left.
- A specific number of timesTe llamó tres veces.He called you three times.
- A sudden change of stateDe repente, me enfadé.Suddenly, I got angry.
- With a closed time expressionAyer llovió toda la tarde.Yesterday it rained all afternoon.
Notice the theme: every one of these is a point on the timeline — something you could put on a calendar or count.
When to use the imperfect
Use the imperfect when the sentence describes how things were — background with no beginning or end in view:
- A habit or repeated actionComía paella todos los domingos.I used to eat paella every Sunday.
- An ongoing action (interrupted later)Hablaba con María...I was talking to María...
- Descriptions and settingEra tarde y llovía.It was late and it was raining.
- Age in the pastTenía diez años.I was ten years old.
- Time and weather as backdropEran las tres.It was three o'clock.
A reliable test: if English lets you say “used to” or “was/were ...-ing” about it, the imperfect is almost always the Spanish answer.
The interruption pattern
The single most useful pattern in the whole topic. When one past action is going on and another breaks in, Spanish combines the tenses in one breath:
Dormía cuando sonó el teléfono.
I was sleeping when the phone rang.
Dormía (imperfect) holds the scene open — the sleeping has no stated end. Sonó (preterite) is the event that lands inside it. The same structure covers Caminaba por la calle cuando vi a Pedro (“I was walking down the street when I saw Pedro”): walking = background, seeing = plot.
Watch for the word cuando — it's the most common flag for this pattern. When one side of cuando is an ongoing action, that side takes the imperfect and the other side takes the preterite.
Conjugations (good news inside)
The imperfect is the easiest tense in Spanish: just three verbs are irregular across the entire language (iba, era, veía). The preterite is regular for most verbs but has a squad of common irregulars you simply meet often enough to memorize.
Preterite endings
- yo hablé / comífui (ser & ir)
- tú hablaste / comistefuiste
- él/ella habló / comiófue · hizo · tuvo · dijo
- nosotros hablamos / comimosfuimos
- ellos hablaron / comieronfueron · hicieron
Watch the accents: hablé and habló carry them; hablo doesn't. The accent is the difference between “I spoke” and “he/she spoke.”
Imperfect endings
- yo hablaba / comíaera (ser) · iba (ir)
- tú hablabas / comíaseras · ibas
- él/ella hablaba / comíaera · iba · veía
- nosotros hablábamos / comíamoséramos · íbamos
- ellos hablaban / comíaneran · iban
That's the whole irregular family: ser → era, ir → iba, ver → veía. Every other verb in the language follows the two regular patterns.
Three traps that change the meaning
1. Duration does not guarantee imperfect
Textbooks say “duration = imperfect,” and learners over-apply it. The real question is whether the period is closed. Viví en Madrid dos años — I lived in Madrid for two years, and that chapter is over, so it's preterite. But Cuando vivía en Madrid... — “When I lived in Madrid...” uses the period as a backdrop for other events, so it's imperfect. Same length of time; different job in the sentence.
2. Four verbs that switch meaning
| Verb | Imperfect | Preterite |
|---|---|---|
| saber | knew | found out |
| conocer | was familiar with | met (for the first time) |
| querer | wanted / loved | tried — and no quiso = refused |
| tener | had / was experiencing | got / received |
These are worth memorizing on their own: lo sabía (“I knew it”) and lo supe (“I found out”) describe genuinely different moments.
3. Weather: backdrop or event?
Weather as scene-setting takes the imperfect: Llovía y hacía frío (“It was raining and cold” — the mood of the scene). Add a closed time frame and it becomes an event: Ayer llovió toda la tarde (“Yesterday it rained all afternoon”). The sky did the same thing; what changed is whether the sentence is painting or reporting.
See it in real stories
News stories are preterite events laid over an imperfect background — the pattern is everywhere once you can see it. These sentences come from actual articles on SpanishReadingDaily, with audio for every word:
“Cuando tenía 22 años, abortó en secreto en Londres.”
When she was 22, she had a secret abortion in London. — tenía (imperfect) sets her age, the background; abortó (preterite) is the event that happened within it. The classic interruption pattern in a single line.
Read the full A2 article →“La fortaleza tenía una función defensiva y aprovechaba la forma del terreno.”
The fortress had a defensive function and made use of the shape of the terrain. — both verbs are imperfect: this is pure description, how the castle was, not something that “happened.”
Read the full B1 article →
Frequently asked questions
What is the easiest way to remember preterite vs imperfect?+
Ask one question: am I reporting a finished event, or describing the background? The preterite moves the story forward — something started, happened, or ended. The imperfect fills in what things were like while it happened — habits, descriptions, ongoing actions, age and time. If you can pin a 'when' on it and it's done, use the preterite. If it was 'going on', use the imperfect.
Are there words that signal which past tense to use?+
Yes. Time expressions that close the event point to the preterite: ayer (yesterday), el lunes pasado (last Monday), a las tres (at three o'clock), una vez (once). Descriptions of how things 'used to be' point to the imperfect: todos los domingos (every Sunday), siempre (always), mientras (while), and especially cuando followed by an ongoing action — Cuando tenía 22 años... ('When I was 22...').
Which tense is harder to conjugate?+
The preterite. The imperfect is almost perfectly regular — only three verbs break the pattern across the entire language: ir (iba), ser (era), and ver (veía). The preterite has a bigger irregular family (fui/fue, hice/hizo, tuve, dije, estuve), but the good news is that the irregulars are among the highest-frequency verbs in Spanish, so you meet them constantly and they stick fast.
Do native speakers notice if I mix them up?+
Sometimes it just sounds slightly off, but with certain verbs it genuinely changes the meaning. Sabía means 'I knew'; supo means 'found out'. Conocía means 'was familiar with'; conoció means 'met (for the first time)'. Quería means 'wanted or loved'; quiso means 'tried', and no quiso means 'refused'. These pairs are worth memorizing on their own.
How do I get practice telling the preterite and imperfect apart?+
Read real Spanish daily, past-tense narratives especially — news stories are full of preterite events on an imperfect background. SpanishReadingDaily publishes a free graded article every day with word-by-word audio, so you hear the tenses as native reporters actually use them, at a level where you catch 95% of the words.
More free grammar guides
Ser vs Estar →
The DOCTOR / PLACE trick, meaning-change adjectives, and the three traps that fool every learner.
Por vs Para →
Para points forward, por looks back — the two-question test and the swap test, with real examples.
The Spanish Subjunctive →
The WEIRDO triggers, the two-subjects rule, and when NOT to use it — explained in plain English.
Gustar & Verbs Like It →
Why gustar works backwards, when it's gusta vs gustan, and the eight other verbs that follow the same pattern.