This document provides information about various past tenses in English including the past simple, past continuous, past perfect, and past perfect continuous. It explains that the past simple expresses completed actions at specific times in the past or past habits. The past continuous describes ongoing or interrupted past actions. The past perfect is used to talk about actions that occurred before other past events. And the past perfect continuous expresses actions that started in the past and continued up until another past time or were interrupted by another past action. Examples are given for each tense.