The document discusses various English verb tenses:
1) The Simple Past Tense is used to talk about completed actions in the past. It is formed by adding "-ed" to regular verbs. Irregular verbs have unique past forms.
2) The Past Continuous Tense describes an ongoing action in the past. It is formed with "was/were + verb+ing".
3) The Past Perfect Tense talks about an action that occurred before something else in the past. It uses "had + past participle".