The document discusses the past continuous tense in Indonesian. The past continuous tense is used to describe actions that were ongoing or in progress in the past. It can be interrupted by other events happening at the same time or combined with other simultaneous actions. Examples are provided like "I was washing clothes yesterday afternoon" and "we were cleaning the house when there was an earthquake last night." The document then provides examples and formulas for forming the positive, negative, and interrogative forms of the past continuous tense in Indonesian.