The past progressive tense, also known as the past continuous tense, is a verb tense in which an action was ongoing for a period of time in the past. Some synonyms for the past progressive tense include the progressive past, the continuous past, and the imperfect past. These synonyms highlight the ongoing nature of the verb tense and emphasize that the action was unfinished or incomplete in the past. The past progressive tense is used to describe actions that were taking place when another action interrupted it or when a specific time in the past ended the action. It is also used to set the scene in narratives or to describe repeated actions in the past.