This document provides examples of using the words "for" and "since" to indicate durations of time in simple sentences. It then gives a short passage for the reader to complete with the present perfect tense of verbs in parentheses. Finally, it provides a short blog post that asks the reader comprehension questions about details mentioned in the blog. The document focuses on practicing English tenses, specifically the present perfect and using "for" and "since" to discuss durations of time.