This document explains the use of the past continuous tense in English. It is used to describe an action that was ongoing or in progress at a specific time in the past. Some key points made include: - The past continuous describes an action that had already begun before the stated time but had not finished. - It is used to ask what someone was doing at a specific time in the past. - It can be used together with the past simple to describe two simultaneous past actions. - It is also commonly used to make polite requests about past actions.