This document provides instruction on using the present perfect tense in English. It explains that the present perfect tense is formed using have/has + past participle and is used to describe actions that began in the past and continue to the present or have recent relevance. It provides examples of using the present perfect with time expressions like "since" and "for" to indicate duration. It also contrasts the present perfect tense with the simple past tense. The document concludes with exercises for students to practice forming and using the present perfect tense correctly.