The document discusses the past continuous tense in English. It provides examples of how to form the past continuous tense using affirmative, negative and interrogative sentences. It also explains different uses of the past continuous tense, including:
1) Describing an action that was in progress at a specific time in the past.
2) Talking about an action that was interrupted by another past action.
3) Talking about two actions that were happening at the same time in the past.
4) Using the past continuous to describe background activities.
5) Expressing irritation about something that often happened in the past using words like "always" or "constantly".