The past progressive (or past continuous) tense is used for actions that were ongoing in the past. It is formed by using the past tense of "to be" (was/were) with the present participle (-ing form) of the main verb. This tense is used to describe an action interrupted by another, two simultaneous actions, or an action in progress at a specific time. How to form the past progressive * Structure: Subject + was/were + verb-ing. * Positive: "She was studying when the phone rang". * Negative: "I was not sleeping". * Question: "Were you watching TV?". How to use the past progressive * An action in progress at a specific time: "At 8 p.m. last night, they were eating dinner". * An action in progress that was interrupted: "He was walking to the store when he saw the accident". * Two simultaneous actions: "While I was cooking, my roommate was cleaning the house". * Habitual actions (often with criticism): ...