Preterite vs Imperfect: When to Use Each Spanish Past Tense
The pretérito indefinido reports a completed past action with a defined timeframe ('Ayer comí pizza' = Yesterday I ate pizza). The pretérito imperfecto describes ongoing actions, habits, descriptions, or background in the past ('Cuando era niño, comía pizza todos los viernes' = When I was a child, I used to eat pizza every Friday). The preterite tells you WHAT happened. The imperfect tells you HOW things were or what was going on.
Choose with one question: 'Did it finish or was it ongoing?'
If the action started and ended in the past at a specific time: preterite. If it described a state, was happening, or was repeated habitually without focus on completion: imperfect. Both tenses often appear in the same sentence — imperfect sets the scene, preterite reports the event.
| Use this when… | Preterite (indefinido) | Imperfect |
|---|---|---|
| Action has a clear endpoint | Yes | No |
| Used to / was ___ing | No | Yes |
| Sequence of completed events | Yes | No |
| Background description | No | Yes |
| Age / time / weather (past) | No | Yes |
| Interrupted by another action | No (it interrupts) | Yes (it gets interrupted) |
| Time markers: ayer, hoy, una vez | Yes | No |
| Time markers: siempre, a menudo, mientras | No | Yes |
Trigger phrases that decide
- Preterite triggers: ayer (yesterday), anoche (last night), el lunes pasado, una vez, dos veces, en 1999, de repente.
- Imperfect triggers: siempre, todos los días, normalmente, a menudo, de niño, mientras, cuando era pequeño.
- Combined: 'Cuando llegué (preterite), llovía (imperfect)' — When I arrived, it was raining.
- Imperfect describes mental and physical states: 'Estaba cansado' (I was tired — background).
- Preterite reports change of state: 'Me cansé' (I got tired — completed event).
Side-by-side: same verb, different past tense
| Context | Form | Spanish | English |
|---|---|---|---|
| comer | comí / comía | Ayer comí pizza. / De niño comía pizza cada viernes. | Yesterday I ate pizza. / As a child I used to eat pizza every Friday. |
| vivir | viví / vivía | Viví en Madrid dos años. / Vivía en Madrid cuando lo conocí. | I lived in Madrid for two years. / I was living in Madrid when I met him. |
| saber | supe / sabía | Lo supe ayer. / Lo sabía desde hacía tiempo. | I found out yesterday (event). / I had known it for a while (state). |
| conocer | conocí / conocía | Conocí a María en 2020. / Conocía a María de la universidad. | I met María in 2020 (event). / I knew María from university (state). |
| querer | quise / quería | Quise ir, pero no pude. / Quería ir, así que fui. | I tried to go (attempted, failed). / I wanted to go, so I went (ongoing desire). |
Verbs that change meaning with the tense
saber
Preterite 'supe' = I found out. Imperfect 'sabía' = I knew (state).
conocer
Preterite 'conocí' = I met (first time). Imperfect 'conocía' = I knew (was acquainted with).
querer
Preterite 'quise' = I tried (attempted action). Imperfect 'quería' = I wanted (ongoing desire). Negative: 'no quise' = I refused, 'no quería' = I didn't want.
poder
Preterite 'pude' = I managed (succeeded). Imperfect 'podía' = I was able / could (background ability). Negative: 'no pude' = I failed, 'no podía' = I wasn't able (ongoing).
Pretérito Indefinido vs Imperfecto — frequently asked
- What is the difference between the preterite and imperfect in Spanish?
- The preterite (pretérito indefinido) reports completed actions with a defined endpoint. The imperfect (pretérito imperfecto) describes ongoing actions, habits, background states, and descriptions in the past. Preterite = what happened. Imperfect = how things were.
- When do I use the preterite in Spanish?
- Use the preterite for completed past actions, sequences of events, sudden actions, and actions with specific time markers like ayer, anoche, una vez, en 1999, de repente. It corresponds roughly to the English simple past.
- When do I use the imperfect in Spanish?
- Use the imperfect for habitual past actions, ongoing past actions, descriptions, background states, age in the past, time of day, weather, and emotions. Trigger phrases include siempre, todos los días, mientras, cuando era pequeño.
- Can preterite and imperfect appear in the same sentence?
- Yes, very often. The imperfect sets the scene or describes background, and the preterite reports the action that interrupted or happened. 'Llovía cuando salí' (It was raining when I left). The imperfect provides context; the preterite provides events.
- What does 'supe' vs 'sabía' mean in English?
- 'Supe' (preterite) means 'I found out' — the moment of discovery. 'Sabía' (imperfect) means 'I knew' — an ongoing state of knowledge. Several Spanish verbs change meaning depending on which past tense you choose: saber, conocer, querer, poder, tener.
Keep going
Continue with the directly related tense, verb, and grammar pages.