This document provides an introduction to Unit 2 which focuses on using the present perfect tense to talk about experiences. It includes: 1. An overview of how to use the present perfect with regular and irregular verbs, ask and answer questions using "Have you ever", and use the simple past for specific experiences. 2. Examples of affirmative and negative present perfect statements and questions. 3. A discussion of common irregular past participles like "been", "gone", and how they are used differently than regular past participles. 4. Ways to have conversations using questions like "Do you?" and "Have you?" to show interest in others' experiences.