The document discusses the present perfect tense. It outlines the form of the present perfect tense in English and provides examples of its use. Specifically, it notes that the present perfect tense is used to (1) describe actions that happened in the past but have present results, (2) describe completed actions without stating a specific time, and (3) describe actions that began in the past and continue into the present. It also discusses using "for" and "since" with periods of time when using the present perfect tense.