The document discusses different uses of verb tenses and structures to talk about the past in English, including:
1) The past simple is used to talk about completed past actions or states, often with time expressions like "yesterday" or "last week". The past continuous is used to describe actions or situations that were in progress at a specific time in the past.
2) When describing one past action that interrupts another ongoing action, use the past simple after "when" and the past continuous with "while/when".
3) "Used to" or "would" are used to talk about repeated or habitual past actions, while "used to" without "would" describes past states or situations that were