The document describes the past continuous tense in English. It explains that the past continuous is formed using the past tense of "to be" plus the present participle (verb + "-ing") of the main verb. It provides examples of affirmative, negative, and interrogative sentences in the past continuous. It also outlines three main uses of the past continuous tense: to describe an interrupted past action, actions happening at a specific time in the past, and two simultaneous actions in the past. An exercise with examples to practice the past continuous tense is included.