The document discusses the past continuous tense in English. It provides the formation of the past continuous, using "was/were + verb+ing". It explains that the past continuous is used to describe actions that were happening or ongoing at a specific time in the past. Examples are given of using the past continuous alongside the past simple tense to describe interrupted actions. A chart is then provided as an example of using the past continuous to ask and answer questions about what someone was doing at different times yesterday.