The document summarizes the difference between using the simple past and past continuous tenses. The simple past is used for short actions, while the past continuous is used for longer actions that were interrupted by another action. Some examples are provided of sentences using "when" with the simple past to show interruption, and sentences using "while" with one verb in the past continuous and one in the simple past to show actions happening simultaneously. Finally, examples are given of situations that can use two verbs in either the past continuous or simple past tenses.