The document defines and provides examples of the present perfect tense. It notes that the present perfect tense describes an event that occurred before a specific time in the past but still continues today, or an event that started and ended in the past but still affects the present. It gives the positive, negative, and interrogative forms. Examples are provided of using the present perfect tense to describe unfinished actions or states that began in the past and continue presently, as well as finished actions representing life experiences.