Here you have some links to practice
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=1496
http://www.impact-english.com/members/Grammar_Practice/Always/test-grammar/gr_prac_use-PPrf.htm
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