Here are some links to practise present perfect vs past simple:
http://www.eflnet.com/grammar/presperf1.php
http://www.eflnet.com/grammar/forsince.php
http://www.eclecticenglish.com/grammar/PresentPerfect1E.html
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex08
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