Preterite & Imperfect Indicators

Determine whether the following adverbs, words that tell when are:
Preterite indicators or Imperfect Indicators
Preterite Indicators show a specific time frame requiring the Preterite Tense
Imperfect Indicators show continuance, repetitiveness, a vague, non-specific, or unended time frame requiring the Imperfect Tense.