Use the following links to practise Present Perfect Simple-Present Perfect Continuous:
http://www.englishpage.com/verbpage/verbs8.htm
http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises
http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex04
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/upperf1.htm
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