This document provides language notes on using present perfect tense in English. It discusses different uses of present perfect including: 1) actions with no specified time that have relevance to the present, 2) stative verbs, 3) recently completed actions, and 4) personal experiences or changes. It also covers time expressions like "just", "already", and "yet" and adverbs like "ever" and "never". Examples are provided to illustrate different uses of present perfect tense.