PRESENT PERFECT EXERCISES

http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises

http://www.englishpage.com/verbpage/verbs5.htm