This document provides information about the present perfect simple tense and past simple tense in English. It discusses the form and uses of the present perfect tense, including life experiences, already/just/yet, superlatives, connection of past and present, duration, and quantity. It then discusses the form, uses, and time expressions of the past simple tense, including finished past actions, actions that follow in a story, past situations/habits, regular and irregular verb forms. It concludes with exercises practicing these tenses in affirmative and negative sentences.