The document provides examples of using simple past tense to talk about activities that were completed in the past. It gives affirmative sentences like "They went to school" and negative sentences like "They did not go to school". It also provides interrogative sentences using "Did" like "Did they go to school?". There are examples of time expressions that can be used with simple past tense, such as "Yesterday", "Last week", "Two days ago". It then provides questions and responses talking about what someone did last week or last Tuesday using simple past tense.