1) Apuntes: The Preterite Tense vs. The Imperfect Tense (3.2)

When do we use the preterite?

To talk about actions that happened in the past and feel completed by the speaker; to talk about a sequence of events

When do we use the imperfect?

To talk about habitual past actions and events; to describe places and people in the past

How to combine the preterite and imperfect when telling stories

We use the imperfect tense to provide background information; we use preterite tense to indicate the main actions.

Verbs that change meaning in the preterite

Conocer and saber