http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?03
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?04
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?05
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?07
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
http://www.ego4u.com/en/cram-up/tests/present-perfect-simple-1
http://www.ego4u.com/en/cram-up/tests/present-perfect-simple-2
http://www.ego4u.com/en/cram-up/tests/present-perfect-simple-3
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex07
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex08
http://www.englishpage.com/verbpage/verbs5.htm
http://www.englishpage.com/verbpage/verbs6.htm
http://www.englishpage.com/verbpage/verbs7.htm
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect.htm
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/pperf1.htm