Purpose

By the end of this lesson, you will be able to choose correctly between the preterite and imperfect tenses based on the nature of the past action being described.

Lesson Explanation

This is genuinely one of the hardest concepts for English speakers, since English has no grammatical distinction here at all — “I ate” covers both. Spanish forces a choice every time you describe the past.

Use the preterite for:

- A completed, one-time action: Comí a las ocho. (I ate at eight.)
- An action with a clear beginning/end, even if long: Viví en México por diez años. (I lived in Mexico for ten years.)
- A sequence of completed events: Llegué, comí y salí. (I arrived, ate, and left.)

Use the imperfect for:

- An ongoing or habitual past action: Comía a las ocho todos los días. (I used to eat at eight every day.)
- Background description, scene-setting, weather, time, age: Eran las ocho y llovía. (It was eight o'clock and it was raining.)
- An interrupted action, versus the interrupting event: Comía cuando sonó el teléfono. (I was eating when the phone rang.)

That last example is genuinely the clearest test case: the ongoing background action (comía, imperfect — “was eating”) gets interrupted by a completed, one-time event (sonó, preterite — “rang”). Whenever a story has a backdrop and a single event breaking into it, the backdrop is imperfect and the interrupting event is preterite.

Practice Questions