Overview | Spanish (Latin America) Grammar

Spanish has two simple past tenses, and choosing between them is often the hardest part of learning to speak about the past. English speakers are used to one all-purpose past (I ate, I was eating, I used to eat), but Spanish forces you to decide: is the action completed or ongoing? Is it foreground or background?

One past, two lenses

Think of the preterite and the imperfect as two different lenses that you point at the same past. The preterite is the camera's shutter click: it captures a moment as a single, finished event. The imperfect is the zoom and pan: it shows you the scene, the mood, what was going on around the event.

Ayer fui al mercado.

Yesterday I went to the market.

Cuando era niño, iba al mercado con mi abuela.

When I was a boy, I used to go to the market with my grandmother.

Both sentences describe the same physical action — going to the market — but they tell very different stories. The first is a single completed trip. The second is a childhood routine.

What the preterite does

The preterite (el pretérito) expresses:

Actions completed at a specific point in the past
Foreground events that move a story forward
Actions with a clear beginning, end, or duration
A sequence of events ("first this, then that")

Llegamos a las ocho, cenamos y nos fuimos a dormir.

We arrived at eight, had dinner, and went to sleep.

Every verb here is preterite because each action is a finished event in a sequence. You can almost check them off: arrived — done; ate — done; went to bed — done.

Ayer escribí tres correos electrónicos.

Yesterday I wrote three emails.

El año pasado visité a mis abuelos en Bogotá.

Last year I visited my grandparents in Bogotá.

Corrí diez kilómetros el domingo.

I ran ten kilometers on Sunday.

Each one is a closed package: action + boundary. You know when it started, when it ended, and you can count it.

What the imperfect does

The imperfect (el imperfecto) expresses:

Ongoing or in-progress actions in the past
Habitual or repeated actions ("used to", "would")
Descriptions of scenes, people, weather, time, age, feelings
Background information that sets the stage

Hacía mucho frío y las calles estaban vacías.

It was very cold and the streets were empty.

De niña, mi mamá trabajaba en un hospital.

As a girl, my mom used to work at a hospital.

Eran las siete de la tarde y el sol brillaba.

It was seven in the evening and the sun was shining.

Cuando tenía doce años, vivíamos en una casa azul.

When I was twelve, we lived in a blue house.

Neither of these is about a single finished event. They paint a scene, a routine, a long-running situation.

A practical rule of thumb

Before choosing a past tense, ask yourself two questions:

Is this a single, completed action, or is it a description / habit / background?
Does the verb move the story forward, or does it tell me what was going on around the action?

If completed or foreground, use the preterite. If ongoing, habitual, descriptive, or background, use the imperfect.

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English often hides the difference. "I lived in Mexico" could be viví (for a defined stretch of time that ended) or vivía (for an ongoing situation or habit). The Spanish tense is not guessing — it is telling the listener how you are viewing the action.

The narration framework: foreground vs background

Every past story in Spanish has two layers:

Foreground — the things that happened, in order. These are the beats of the story. They move time forward. They use the preterite.
Background — the things that were going on while the foreground unfolded. Setting, weather, feelings, descriptions, age, ongoing situations. They do not move time forward. They use the imperfect.

Think of the foreground as the footprints walking across the scene, and the background as the landscape they walk through. Without footprints, nothing happens. Without landscape, there is no scene.

Era un día soleado. Los pájaros cantaban y la gente paseaba por el parque. De pronto, un niño gritó y todos voltearon a mirarlo.

It was a sunny day. The birds were singing and people were strolling through the park. Suddenly, a boy shouted and everyone turned to look at him.

Here, the first three verbs — era, cantaban, paseaba — are imperfect, because they set the background. Then gritó and voltearon are preterite, because they are the events that actually happened in the sequence.

The interruption pattern

One of the most classic foreground/background patterns is the interruption: an ongoing action (imperfect) gets cut off by a sudden event (preterite). This pattern almost always appears with cuando.

Imperfect + cuando + preterite.

Dormía cuando sonó el teléfono.

I was sleeping when the phone rang.

Caminábamos por la calle cuando empezó a llover.

We were walking down the street when it started to rain.

Ella leía un libro cuando entró su padre.

She was reading a book when her father came in.

Yo cocinaba la cena cuando se fue la luz.

I was cooking dinner when the power went out.

Los niños jugaban en el jardín cuando vieron al perro perdido.

The kids were playing in the garden when they saw the lost dog.

The ongoing action is painted with the imperfect (you were in the middle of it); the sudden, punctual event that broke into it is the preterite. This pattern is so reliable that if you spot cuando in a past sentence, you can almost predict the tense mix.

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Flip the pattern and the meaning flips with it. "Cuando dormí, sonó el teléfono" sounds strange because you are claiming a completed sleep was interrupted. Native speakers want the interrupted action in the imperfect.

Change-of-state verbs: saber, conocer, poder, querer

A small group of verbs translate differently into English depending on whether you use preterite or imperfect. Their imperfect form describes an ongoing state; their preterite form describes the moment that state changed.

Verb	Imperfect (state)	Preterite (change of state / event)
saber	sabía — "I knew (a fact)"	supe — "I found out, I learned"
conocer	conocía — "I knew (a person/place)"	conocí — "I met (for the first time)"
poder	podía — "I could, I was able to"	pude — "I managed to, I succeeded in"
no poder	no podía — "I couldn't (general)"	no pude — "I failed to, I couldn't (despite trying)"
querer	quería — "I wanted"	quise — "I tried to, I decided to"
no querer	no quería — "I didn't want"	no quise — "I refused"
tener	tenía — "I had"	tuve — "I got, I received"

Sabía que estabas en casa.

I knew you were home. (Ongoing knowledge.)

Supe que estabas en casa ayer.

I found out yesterday that you were home. (Moment of learning.)

Conocía a Marta desde hacía años.

I had known Marta for years. (Ongoing acquaintance.)

Conocí a Marta en la fiesta.

I met Marta at the party. (The first meeting.)

No podía abrir la puerta.

I couldn't open the door. (General inability.)

No pude abrir la puerta.

I couldn't open the door (despite trying). (Failure at a specific moment.)

Quería ir a la fiesta.

I wanted to go to the party. (Ongoing desire — we don't know if I went.)

Quise ir a la fiesta.

I tried to go to the party. (I made the attempt — often implies I didn't succeed.)

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These meaning shifts are not exceptions — they follow the same logic. The imperfect describes how things were; the preterite marks the instant something changed.

The same story told two ways

To really feel the contrast, read the same short narrative in two different ways. First, mostly in the imperfect:

Era sábado por la mañana. Hacía sol. Yo estaba en casa y leía una novela. Mi hermano dormía en el cuarto de al lado. No había nadie más en la casa.

It was Saturday morning. It was sunny. I was at home, reading a novel. My brother was sleeping in the next room. There was no one else in the house.

Nothing really happens in that paragraph. It is pure background — a scene waiting for something to occur. Now watch what happens when preterite events enter:

Era sábado por la mañana. Hacía sol. Yo estaba en casa y leía una novela cuando, de repente, alguien llamó a la puerta. Me levanté, caminé hasta la entrada y la abrí. Era mi vecina. Me dijo que mi coche estaba bloqueando su entrada, así que bajé las escaleras rápidamente y lo moví.

It was Saturday morning. It was sunny. I was at home, reading a novel, when suddenly someone knocked at the door. I got up, walked to the entrance, and opened it. It was my neighbor. She told me my car was blocking her driveway, so I went down the stairs quickly and moved it.

Now there is a story. The imperfect sets the stage — the weather, the day, what I was doing — and the preterite introduces the events that actually occurred: llamó, me levanté, caminé, abrí, me dijo, bajé, moví. Foreground and background together is how Spanish tells stories.

Time-marker reference table

Certain expressions almost always signal one tense or the other. Memorizing these speeds up your choice.

Preterite markers	Imperfect markers
ayer (yesterday)	siempre (always)
anoche (last night)	todos los días (every day)
el lunes pasado (last Monday)	todos los años (every year)
el año pasado (last year)	cada sábado (every Saturday)
hace dos semanas (two weeks ago)	a menudo (often)
de repente (suddenly)	normalmente (usually)
en ese momento (at that moment)	generalmente (generally)
una vez (once)	cuando era niño/a (when I was a child)
dos veces (twice)	mientras (while)
finalmente (finally)	de vez en cuando (from time to time)

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The markers are a strong hint, not a law. "Siempre" usually signals the imperfect, but "siempre te llamé los domingos, y nunca me respondiste" is a valid preterite sentence if you are summing up a finished series of attempts.

English-speaker pitfalls

❌ Cuando era niño, fui a la playa todos los veranos. / ✅ Cuando era niño, iba a la playa todos los veranos.

When I was a child, I used to go to the beach every summer. (Habitual → imperfect.)

❌ Ayer iba al supermercado. / ✅ Ayer fui al supermercado.

Yesterday I went to the supermarket. (Single completed trip → preterite.)

❌ Lo supe desde hace años. / ✅ Lo sabía desde hace años.

I had known it for years. (Ongoing state of knowledge → imperfect.)

❌ Conocía a mi esposo en 2010. / ✅ Conocí a mi esposo en 2010.

I met my husband in 2010. (Meeting = change of state → preterite.)

❌ Mientras estudié, mi hermana cocinó. / ✅ Mientras estudiaba, mi hermana cocinaba.

While I was studying, my sister was cooking. (Two ongoing actions → both imperfect.)

❌ Hacía calor ayer a las tres. / ✅ Hizo calor ayer a las tres.

It was hot yesterday at three. (A specific, bounded moment → preterite of hacer.)

❌ Cuando dormía, el teléfono sonaba. / ✅ Cuando dormía, el teléfono sonó.

When I was sleeping, the phone rang. (Interruption → preterite.)

❌ Fui muy feliz de niña. / ✅ Era muy feliz de niña.

I was very happy as a little girl. (Description of how I was over time → imperfect.)

❌ Estaba dos horas en el banco. / ✅ Estuve dos horas en el banco.

I was at the bank for two hours. (Defined duration → preterite.)

❌ Tenía que estudiar anoche y estudié. / ✅ Tuve que estudiar anoche y estudié.

I had to study last night and I did. (Specific obligation that was fulfilled → preterite.)

A useful check: if you translate the English as "used to" or "was -ing," Spanish almost always wants the imperfect. If you translate as a plain past with a time boundary, the preterite is usually right.

Dialogue example

Listen to how the two tenses weave through normal conversation. Every preterite is a completed event; every imperfect is a description or ongoing action.

Diego: ¿Qué hiciste el fin de semana? (preterite — asking about completed events) Sara: Pues, el sábado fui al cine con Ana. Vimos una película que estaba bastante buena. (preterite for the events, imperfect for the description of the movie) Diego: ¿Qué película? Sara: Una de ciencia ficción. Mientras la veíamos, Ana se durmió. (imperfect for the ongoing viewing, preterite for the sudden falling asleep) Diego: ¿En serio? ¿Y no la despertaste? Sara: La desperté al final, cuando salían los créditos. Estaba muy cansada porque había trabajado toda la semana. (preterite for the waking, imperfect for the state) Diego: ¿Y qué tal el domingo? Sara: El domingo me quedé en casa. Llovía todo el día, así que no quise salir. (preterite for "stayed" and "didn't want to go out" — a decision made once — imperfect for the ongoing rain) Diego: Yo tampoco hice nada. Me levanté tarde, desayuné y leí un rato. Mientras leía, mi gato dormía en mi regazo. (preterite for the sequence of morning events, imperfect for the parallel ongoing actions)

Almost every sentence mixes the two tenses. That is the norm in Spanish, not the exception. The foreground and the background live side by side.

Parallel vs interrupted actions

Two imperfect verbs next to each other usually means the two actions were both in progress at the same time — they were happening in parallel, each forming part of the background.

Mientras yo cocinaba, mi hermana leía en el sofá.

While I was cooking, my sister was reading on the sofa.

Los niños jugaban en el jardín y el perro corría detrás de ellos.

The kids were playing in the garden and the dog was running behind them.

Two preterite verbs, on the other hand, usually describe a sequence: first one thing happened, then the next.

Llegué a casa, me quité los zapatos y encendí el televisor.

I got home, took off my shoes, and turned on the TV.

A mix of the two — an imperfect plus a preterite — almost always signals the interruption pattern covered earlier.

The "happened and finished" test

A quick last-resort test: if you could translate the sentence in English with "was happening" or "used to," lean imperfect. If you could translate it with "happened" or "did," lean preterite.

Cuando era joven, jugaba al fútbol todos los fines de semana.

When I was young, I used to play soccer every weekend. (used to → imperfect)

El sábado pasado jugué al fútbol con mis amigos.

Last Saturday I played soccer with my friends. (happened, one time → preterite)

Common traps with ser and estar in the past

Two verbs that English speakers routinely mis-tense in the past are ser and estar. Remember: if you are describing how something was in general, use the imperfect. If you are marking a specific, bounded moment, use the preterite.

Era un día tranquilo.

It was a quiet day. (Description → imperfect.)

Fue un día muy largo.

It was a very long day. (The completed whole → preterite.)

Estaba cansada toda la mañana.

I was tired all morning. (Ongoing state → imperfect.)

Estuve en Perú dos semanas.

I was in Peru for two weeks. (Closed duration → preterite.)

With ser and estar, the trick is often whether the sentence names a bounded chunk of time. If yes, preterite. If it just describes how things were, imperfect.

Había mucha gente en la plaza.

There were a lot of people in the square. (Ongoing description → haber imperfect: había.)

Hubo un accidente anoche.

There was an accident last night. (A single event that happened → haber preterite: hubo.)

The same logic applies to haber. Había paints a scene. Hubo marks an event.

Quick-reference summary

Ask yourself	Preterite	Imperfect
Did it happen once, completed?	yes	—
Was it ongoing / in progress?	—	yes
Was it habitual or repeated?	—	yes
Is it describing a scene?	—	yes
Was it an interruption?	yes	—
Was it interrupted?	—	yes
Weather, time, age?	—	yes (usually)
Defined duration (por X años)?	yes	—
Change of state?	yes	—
Ongoing feeling / state?	—	yes
Sequence of completed events?	yes	—
Two actions at once (parallel)?	—	yes

What comes next

The following pages dig into specific patterns where the two tenses meet:

Background vs foreground — using both tenses in a story
Interrupted actions — the classic "when" pattern
Changes of state — moments of change vs ongoing states
Completed vs habitual — same action, two aspects
Time markers — words that pair with each tense
Verbs that change meaning — saber, conocer, poder, querer
Combined narration — a worked example

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Do not expect to master this overnight. Every intermediate Spanish learner wrestles with the preterite-imperfect contrast for months. Reading and listening to real narratives is the fastest way to internalize the choice.

By the end of this section, the decision will feel less like a grammar puzzle and more like a choice of perspective — exactly what native speakers make every time they tell a story.