This document provides an overview and examples of English verb tenses including the present perfect, present perfect progressive, and differences between the simple past and present perfect. It discusses the forms, meanings, and uses of these tenses. Key points covered include using the present perfect to refer to unspecified past times or ongoing situations, the difference between simple past for specific past events and present perfect for unspecified times, and how to properly use time expressions like "since" and "for" with different tenses. Practice exercises with examples are provided to help explain the uses and meanings of these verb tenses.