Learn the core difference: completed actions (preterite) vs ongoing actions (imperfect)
Master trigger words that signal which tense to use
Understand verbs that change meaning (saber, conocer, querer)
See both tenses working together in real sentences
Why This Is the Hardest Decision in Spanish
You have learned present tense. Now you try to tell a simple story: “Yesterday I was walking to the store when I saw my friend.”
But Spanish makes you choose:
Was the walking a background action? → Imperfect
Was the seeing a completed event? → Preterite
This guide gives you clear rules, abundant examples with English translations, and practice strategies that work.
The Core Difference: Completed vs Ongoing
The fundamental distinction is simple:
Tense
Core Idea
English Equivalent
Preterite
Completed actions with a clear beginning or end
“I ate,” “She left,” “They finished”
Imperfect
Ongoing actions without defined endpoints
“I was eating,” “She used to leave,” “They were finishing”
Think of it this way: Preterite captures snapshots. Imperfect describes background scenes.
When to Use Preterite (Completed Actions)
1. Single Completed Events
Spanish
English
Ayer comí a las dos.
Yesterday I ate at two o’clock.
Terminé el libro la semana pasada.
I finished the book last week.
Ella llamó a su madre.
She called her mother.
El partido terminó a las nueve.
The game ended at nine o’clock.
2. Actions with Specific Timeframes
Spanish
English
Viví en México por dos años.
I lived in Mexico for two years.
Estudié de ocho a diez.
I studied from eight to ten.
Trabajé allí durante cinco años.
I worked there for five years.
La reunión duró tres horas.
The meeting lasted three hours.
3. Series of Completed Actions
Spanish
English
Me levanté, me vestí y salí.
I got up, got dressed, and left.
Llegué a casa, abrí la puerta y entré.
I arrived home, opened the door, and entered.
Compré el boleto, subí al tren y me senté.
I bought the ticket, got on the train, and sat down.
Se despertó, se bañó y desayunó.
He woke up, showered, and had breakfast.
4. Sudden Changes or Beginnings and Ends
Spanish
English
El teléfono sonó.
The telephone rang.
Empezó a llover.
It started to rain.
De repente, la puerta se abrió.
Suddenly, the door opened.
El niño comenzó a llorar.
The child began to cry.
When to Use Imperfect (Ongoing Actions)
1. Habitual or Repeated Actions
Spanish
English
Cuando era niño, jugaba al fútbol.
When I was a child, I used to play soccer.
Siempre íbamos a la playa en verano.
We always went to the beach in summer.
Cada mañana tomaba café.
Every morning I used to drink coffee.
Los domingos visitábamos a los abuelos.
On Sundays we used to visit our grandparents.
2. Ongoing Actions in Progress
Spanish
English
Mientras estudiaba, escuchaba música.
While I was studying, I was listening to music.
Ellos hablaban cuando llegué.
They were talking when I arrived.
Ella cocinaba mientras él leía.
She was cooking while he was reading.
Yo caminaba por el parque.
I was walking through the park.
3. Descriptions in the Past
Spanish
English
Era una casa grande y blanca.
It was a big, white house.
Tenía los ojos azules.
He had blue eyes.
El cielo estaba despejado.
The sky was clear.
La ciudad era pequeña y tranquila.
The city was small and quiet.
4. Time, Age, and Weather in the Past
Spanish
English
Eran las tres de la tarde.
It was three o’clock in the afternoon.
Tenía veinte años.
I was twenty years old.
Hacía buen día.
It was a nice day.
Era un día soleado.
It was a sunny day.
Key Trigger Words for Each Tense
Preterite Triggers
English
Imperfect Triggers
English
ayer
yesterday
siempre
always
anoche
last night
a menudo
often
anteayer
the day before yesterday
generalmente
generally
la semana pasada
last week
cada día
every day
el año pasado
last year
todas las semanas
every week
entonces
then
frecuentemente
frequently
de repente
suddenly
mientras
while
una vez
one time
cuando era niño
when I was a child
por fin
finally
de niño
as a child
al final
in the end
nunca
never (habitual)
Real-Life Examples Showing Both Tenses
Example 1
Spanish
English
Eran las ocho de la noche. (imperfect)
It was eight o’clock at night.
Empezó a llover. (preterite)
It started to rain.
Example 2
Spanish
English
Estaba estudiando cuando (imperfect)
I was studying when
el teléfono sonó. (preterite)
the telephone rang.
Example 3
Spanish
English
Íbamos al cine todos los viernes. (imperfect)
We used to go to the movies every Friday.
Pero la semana pasada fuimos el sábado. (preterite)
But last week we went on Saturday.
Example 4
Spanish
English
Hacía sol y los pájaros cantaban. (imperfect)
It was sunny and the birds were singing.
De repente, escuché un ruido. (preterite)
Suddenly, I heard a noise.
Example 5
Spanish
English
Cuando vivía en Madrid, (imperfect)
When I lived in Madrid (background),
conocí a mi mejor amigo. (preterite)
I met my best friend.
Common Verbs with Different Meanings
Some verbs change meaning depending on which past tense you use. This is essential for accurate communication.
Saber (to know / to find out)
Tense
Spanish
English
Preterite
Supe la verdad ayer.
I found out the truth yesterday.
Imperfect
Sabía la respuesta.
I knew the answer.
Conocer (to know / to meet)
Tense
Spanish
English
Preterite
Conocí a María ayer.
I met María yesterday.
Imperfect
Conocía Madrid bien.
I knew Madrid well.
Querer (to want / to try)
Tense
Spanish
English
Preterite
Quise ayudarle, pero no pude.
I tried to help him, but I could not.
Imperfect
Quería ayudarle.
I wanted to help him.
No querer (to not want / to refuse)
Tense
Spanish
English
Preterite
No quise ir.
I refused to go.
Imperfect
No quería ir.
I did not want to go.
Poder (to be able to / to manage to)
Tense
Spanish
English
Preterite
Pude terminar a tiempo.
I managed to finish on time.
Imperfect
Podía ver la montaña desde mi ventana.
I could see the mountain from my window.
Tener (to have / to receive or get)
Tense
Spanish
English
Preterite
Tuve una idea.
I got an idea.
Imperfect
Tenía un coche rojo.
I had a red car.
Quick Reference Chart
Situation
Preterite
Imperfect
Completed actions
Yes
No
Ongoing actions
No
Yes
Specific time (ayer, el año pasado)
Yes
No
Habitual actions (used to)
No
Yes
Descriptions (age, weather, time)
No
Yes
Sudden events
Yes
No
Background actions
No
Yes
Series of completed events
Yes
No
Quick Reference Chart for Preterite vs Imperfect
Common Mistakes to Avoid
Incorrect Spanish
Correct Spanish
Why
Ayer jugaba fútbol.
Ayer jugué fútbol.
“Ayer” (yesterday) signals a specific completed action → Preterite
Cuando era niño, fui a la escuela cada día.
Cuando era niño, iba a la escuela cada día.
A habitual past action (“every day”) → Imperfect
La casa fue grande.
La casa era grande.
A description (size) → Imperfect
De repente, llovía.
De repente, llovió.
“De repente” (suddenly) signals a sudden event → Preterite
Siempre comí pizza los viernes.
Siempre comía pizza los viernes.
A habitual action (“always”) → Imperfect
Preterite vs ImperfectPractice Tips for Mastery
Learn the trigger words – Memorize the key words that signal each tense. Print the trigger word chart and keep it visible.
Practice with stories – Write short paragraphs using both tenses. First describe the scene (imperfect), then narrate what happened (preterite).
Listen for context – Watch Spanish-language content with subtitles. Pause when you hear a past tense verb and ask yourself why that tense was chosen.
Use the “interruption” rule – If Action A was happening (imperfect) when Action B interrupted it (preterite), you will often use both tenses in the same sentence.
Test yourself – Cover the right column of the example tables and translate from English to Spanish out loud.
Ready to Practice?
Theory is useless without testing. Click below to apply these rules immediately.
Remember: Every native Spanish speaker learned this by making mistakes. The key is consistent practice with real examples.
❓ Frequently Asked Questions: Preterite vs Imperfect
A: Preterite describes completed actions with a clear beginning or end (like a snapshot). Imperfect describes ongoing, habitual, or background actions without defined endpoints (like a movie scene). For example: Comí (I ate – preterite) vs Comía (I used to eat / I was eating – imperfect).
A: Look for trigger words. Preterite triggers include ayer (yesterday), anoche (last night), de repente (suddenly). Imperfect triggers include siempre (always), cuando era niño (when I was a child), todos los días (every day). Also, use imperfect for descriptions (age, weather, time) and preterite for specific events.
A: Yes, very often. Use imperfect to describe what was happening (background) and preterite for the action that interrupted or occurred. Example: Yo estudiaba (imperfect – I was studying) cuando el teléfono sonó (preterite – when the telephone rang).
A: The most important ones are: saber (preterite = found out, imperfect = knew), conocer (preterite = met, imperfect = knew), querer (preterite = tried, imperfect = wanted), no querer (preterite = refused, imperfect = did not want), poder (preterite = managed to, imperfect = was able to), and tener (preterite = got/received, imperfect = had).
A: The most common irregular preterite verbs include: ser/ir (fui, fuiste, fue, fuimos, fuisteis, fueron), tener (tuve, tuviste, tuvo, tuvimos, tuvisteis, tuvieron), estar (estuve, estuviste, estuvo, estuvimos, estuvisteis, estuvieron), hacer (hice, hiciste, hizo, hicimos, hicisteis, hicieron), decir (dije, dijiste, dijo, dijimos, dijisteis, dijeron), and venir (vine, viniste, vino, vinimos, vinisteis, vinieron).
A: Unlike preterite, imperfect has only three irregular verbs: ser (era, eras, era, éramos, erais, eran), ir (iba, ibas, iba, íbamos, ibais, iban), and ver (veía, veías, veía, veíamos, veíais, veían). All other verbs follow regular imperfect patterns.
A: Use three strategies: (1) Learn trigger words and test yourself with flashcards. (2) Write short stories – first describe the scene (imperfect), then narrate events (preterite). (3) Take our interactive quizzes repeatedly until the patterns feel natural. Consistent practice with real examples works best.
A: Always use imperfect for weather, time, and age when setting the scene: Eran las tres (It was three o’clock), Hacía sol (It was sunny), Tenía diez años (I was ten years old). Use preterite only when these elements change or begin: Empezó a llover (It started to rain – preterite), Llegué a las tres (I arrived at three – preterite).
