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Imp vs Pret

choosing when to use Imperfect or Preterite

"used to _____" or "was ______ing" Imperfect
actions going on for indefinite period of time Imperfect
completed specific actions Preterite
time in the past Imperfect
actions occurring at a specific time, especially interrupting a previous ongoing/background (Imperfect) action Preterite
age in the past Imperfect
describing background in a story Imperfect
describing main events in a story or main actions Preterite
action repeated a specific amount of times or happened just once Preterite
weather in the past Imperfect