The document discusses the past continuous tense in English. It explains the form of the past continuous tense in positive, negative, and yes/no question sentences. It then provides four uses of the past continuous tense: 1) to describe an action that was in progress at a specific time in the past, 2) to describe an action that was ongoing over a period of time in the past, 3) to describe a longer ongoing action that was interrupted by a shorter action in simple past tense, 4) to describe a temporary or non-permanent action in the past. It concludes by contrasting the past continuous and past simple tenses.