Preterite vs imperfect: how to choose in real Spanish
Both the preterite and the imperfect talk about the past, but they do different jobs. The preterite usually presents an event as a completed unit. The imperfect usually gives background, habits, descriptions or an action already in progress.
Use the preterite for completed events
Yesterday I bought a book.
Llegamos a las ocho.
We arrived at eight.
These actions are viewed as complete events with a boundary.
Use the imperfect for background and repeated past actions
When I was a child, I used to play outside every day.
Hacía frío y llovía.
It was cold and it was raining.
One event can interrupt another
I was studying when the phone rang.
Estudiaba sets the ongoing background. Sonó marks the completed event that entered the scene.
Signal words can help, but context wins
- Preterite often appears with ayer, una vez, de repente, a las ocho.
- Imperfect often appears with siempre, todos los días, mientras, de niño.
Do not choose a tense only because of one keyword. The speaker's view of the event matters more.
A common learner mistake
✅ Cuando era niño, jugaba al fútbol todos los sábados.
For a repeated background habit, the imperfect is the natural choice.
Practice with complete sentences
Instead of memorizing two separate rule lists, review paired examples. Contrast Ayer fui al cine with Cuando era joven, iba al cine cada viernes. This trains the meaning of the tense inside context.
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Complete: Yo ___ cuando sonó el teléfono.