The document discusses the simple past tense and provides examples of using it to talk about daily routines and activities that were different from usual in the past. Specifically, it gives common daily routines and asks the reader to write a paragraph describing their own activities from yesterday, prompting them to include details about what time they woke up, what they did after waking up, what they had for breakfast, what they did after breakfast, what they did at lunchtime, what they had for dinner, and what time they went to bed.