Spanish has two simple past tenses, and knowing when to use each one is one of the most important grammar skills you can master. The preterite (pretérito indefinido) and the imperfect (pretérito imperfecto) are not interchangeable — each tells a different kind of story about the past. This guide walks you through the core rules, signal words, a full narrative example, and the handful of verbs that actually change meaning depending on which tense you use.
The single most useful way to distinguish these two tenses is to ask yourself whether the past action was completed or ongoing (background).
The preterite describes actions that started and ended at a definite point in the past. Think of it as a snapshot — something happened, it finished, and you can draw a clear boundary around it. ¿Comiste? (Did you eat?) expects a yes or no because it refers to a specific completed event.
The imperfect describes actions that were in progress, habitual, or simply describe a background state at some past time. There is no clear endpoint in view. ¿Comías mucho de niño? (Did you eat a lot as a child?) asks about a general past habit, not one specific meal.
A helpful mental image: picture a movie. The preterite is the plot — events that drive the story forward. The imperfect is the scenery and the soundtrack — it sets the scene without moving the action forward.
Use the preterite when the action or state:
Use the imperfect when describing:
Certain time expressions almost always appear with one tense or the other. Learning these signal words is a fast shortcut for getting the right tense in everyday writing and conversation.
| Preterite Signal Words | Meaning | Imperfect Signal Words | Meaning |
|---|---|---|---|
| ayer | yesterday | siempre | always |
| anoche | last night | nunca | never |
| el lunes pasado | last Monday | todos los días | every day |
| el año pasado | last year | cada semana | every week |
| hace + time | X ago (e.g., hace dos años) | generalmente | generally, usually |
| de repente | suddenly | normalmente | normally |
| en ese momento | at that moment | a menudo | often |
| una vez / dos veces | once / twice | de niño / de joven | as a child / as a young person |
| por fin | finally | mientras | while (ongoing action) |
| de pronto | all of a sudden | cuando era pequeño/a | when I was little |
Note that cuando (when) can appear with either tense, so it is not a reliable signal on its own. What matters is whether the event at that moment was completed (preterite) or ongoing (imperfect).
The most natural Spanish storytelling weaves both tenses together: the imperfect builds the scene, and then the preterite drives events forward. Read the following short paragraph and study how each verb works.
“Era una tarde de invierno. Hacía mucho frío y las calles estaban casi vacías. Yo caminaba hacia la librería cuando de repente vi a mi amigo Luis. Llevaba un sombrero raro y parecía nervioso. Me saludó rápidamente, sacó un libro de su bolsa y me lo dio.”
Now let’s look at each underlined verb:
| Verb (Spanish) | Tense | English | Why this tense? |
|---|---|---|---|
| hacía frío | Imperfect | It was very cold | Background weather condition, ongoing and indefinite. |
| estaban vacías | Imperfect | the streets were almost empty | Background description of state, no specific endpoint. |
| caminaba | Imperfect | I was walking | Ongoing action — sets the scene for what interrupts it. |
| vi | Preterite | I saw | Completed, momentary event that interrupts the walking. |
| llevaba | Imperfect | he was wearing | Description of his appearance at that moment — ongoing state. |
| parecía | Imperfect | he seemed | Description of his mental/emotional state, no clear endpoint. |
| saludó | Preterite | he greeted me | Single completed action in the sequence of events. |
| sacó | Preterite | he took out | Second completed action driving the story forward. |
| dio | Preterite | he gave [it to me] | Third completed action — the climax of the sequence. |
Notice the pattern: the imperfect verbs pile up at the start to paint the picture, and then the preterite verbs march forward one by one, each moving the story to the next beat. This interplay is the heart of Spanish narrative writing.
A small but important group of verbs have noticeably different English translations depending on whether you use the preterite or the imperfect. This happens because the preterite focuses on the moment something changed or happened, while the imperfect describes an ongoing mental state.
| Verb | Imperfect meaning | Preterite meaning |
|---|---|---|
| saber | sabía — I knew (a fact, ongoing knowledge) | supe — I found out / I learned (the moment of discovery) |
| conocer | conocía — I knew (a person or place, ongoing familiarity) | conocí — I met (for the first time) |
| querer | quería — I wanted / I loved (ongoing desire or feeling) | quise — I tried to (but the context often implies an attempt); no quise — I refused |
| poder | podía — I was able to / I could (general ability, ongoing) | pude — I managed to / I succeeded in; no pude — I failed to / I couldn’t (on that occasion) |
| tener | tenía — I had (possession or state, ongoing) | tuve — I received / I got (the moment of receiving, e.g., tuve una llamada = I got a call) |
| haber | había — there was / there were (existential, descriptive) | hubo — there was / there were (a specific event occurred, e.g., hubo un accidente) |
Example in context: Ya sabía que él era de Argentina, pero ayer supe que también había vivido en Chile. (I already knew he was from Argentina, but yesterday I found out he had also lived in Chile.)
Before you can use these tenses confidently, you need the endings cold. Here are the regular preterite endings for -ar, -er, and -ir verbs, using hablar (to speak), comer (to eat), and vivir (to live) as models.
| Subject | -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 |
Important: -er and -ir verbs share the same preterite endings. Notice the accent marks on yo and él/ella/usted forms — these are mandatory and change the meaning without them (e.g., hablé = I spoke; hable = subjunctive).
The imperfect has very few irregulars (only ser, ir, and ver), and the regular endings are highly predictable. Here are the regular imperfect endings using the same model verbs.
| Subject | -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 |
Notice that -er and -ir verbs again share the same endings in the imperfect. The -ar endings all contain the vowel a, and the -er/-ir endings all carry an accent on the í. The yo and él/ella forms are identical — context usually makes the subject clear.
Using the preterite for habits. Many English speakers say fui (I went, preterite) when describing a childhood routine. In Spanish, iba (imperfect) is correct for repeated past actions: Iba a la playa todos los veranos. (I used to go to the beach every summer.)
Forgetting the accent marks in the preterite. Hablo means “I speak” (present); habló means “he/she spoke” (preterite). The accent is not optional.
Translating “was” automatically as imperfect. Estuvo (preterite of estar) describes a state that began and ended: Estuvo enfermo tres días. (He was sick for three days [and then he recovered].) Estaba enfermo would describe an ongoing background condition without specifying when it ended.
Mishandling mental-state verbs. Verbs like saber, conocer, querer, and poder default to imperfect in most past contexts because they describe ongoing states. Reserve the preterite form for the specific moment a state changed (finding out, meeting someone for the first time, etc.).
• Ask yourself: did it have an endpoint? If you can point to when the action finished, choose the preterite. If the action just “was happening” without a clear end in sight, use the imperfect.
• Use the “used to / was -ing” test. If you could translate the action as “used to” or “was [verb]-ing,” the imperfect is almost certainly correct.
• Count the occurrences. If a specific number is mentioned (“three times,” “once,” “twice”), lean strongly toward the preterite.
• Memorize the meaning-change verbs as pairs. Learn sabía / supe, conocía / conocí, quería / quise, and podía / pude together. When you see these verbs, pause and ask which meaning fits the context.
• Read authentic Spanish texts and label the verbs. Pick any short newspaper article or story in Spanish and underline every past-tense verb. Try to identify whether it is preterite or imperfect and why. This active practice locks in the patterns faster than drills alone.
Try translating these sentences into Spanish using the correct past tense. Think about whether each action is completed, habitual, or a background description.
Suggested answers: (1) Cuando era niño/a, comía cereales todas las mañanas. (2) Ayer me llamó a mediodía y me contó la noticia. (3) Llovía y las calles estaban mojadas cuando ocurrió el accidente. (4) Ya sabía su nombre, pero lo conocí por primera vez en la fiesta. (5) Siempre iban a la montaña en verano; el agosto pasado fueron a la costa.