PRESENT PERFECT EXERCISES

http://www.agendaweb.org/exercises/verbs/present-perfect
http://www.agendaweb.org/exercises/verbs/present-perfect-multiple
http://www.agendaweb.org/exercises/verbs/present-perfect-sentences
http://www.focus.olsztyn.pl/en-present-perfect-tense-exercises-with-answers.html#.WDS4t-bhDIU
http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements2.htm
http://www.agendaweb.org/exercises/verbs/present-perfect-mixed