This document discusses the past continuous tense in English. It provides the basic structure of subject + was/were + verb+ing and examples like "The man was singing". The past continuous is used to describe actions that were ongoing or in progress in the past. It can be used to talk about (1) duration of past actions of unknown length, (2) interrupted past actions, and (3) simultaneous past actions. Additional uses include polite questions and expressing irritation over past events.