This document summarizes and provides examples of the past simple tense, present perfect tense, present perfect continuous tense, and past perfect tense in English. It explains that the past simple tense is used for finished actions in the past, while the present perfect tense is used for unfinished actions that started in the past and continue to the present. It provides examples of each tense and how to use the past perfect tense to describe an action that occurred before another past action. The document concludes with noting the pattern for the past perfect tense and an exercise for students to practice.