What are Spanish imperfect tense for ( was writing )?

The Spanish imperfect tense is used to describe ongoing or habitual actions in the past, such as "was writing," which indicates an action that was in progress at a specific time. It can also express background information, set the scene, or describe physical and emotional states in the past. For example, "estaba escribiendo" translates to "was writing," emphasizing that the action was not completed at that moment.