Imperfect Tense is used to talk about the:

Is an action (not a thought or description) used for preterite tense or imperfect tense?

Is something that occurred at an exact moment in time in the past (something that you can pinpoint) used for preterite tense or imperfect tense?

Is repeated, habitual, or continuous actions used for preterite or imperfect tense?

Are actions that started in the past when another action or event occurred used for preterite or imperfect tense?

Is something that began and was completed totally in the past and was not ongoing used for preterite or imperfect tense?

Are times, dates, and ages used for preterite or imperfect tense?

Are descriptions of feelings, character traits, conditions, settings, and circumstances used for preterite or imperfect tense?