Why is the Present Perfect such a problematic tense?

Seminar paper from the year 2003 in the subject Didactics for the subject English - Pedagogy, Literature Studies, grade: Sehr Gut, University of Innsbruck (Anglistik und Amerikanistik), language: English, abstract: It has to be mentioned that this paper mainly deals with the Present Perfect Simple because otherwise this topic would have become too complex. Furthermore, the present perfect is not always used the same way in British and American English. In the current paper, however, the use...