Present Perfect and Past Simple

http://www.ego4u.com/en/cram-up/grammar/simpas-preper
http://www.englishpage.com/verbpage/verbs5.htm
http://www.saberingles.com.ar/curso/lesson21/06.html

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Past Simple Exercises

http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-past.php
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_mix.htm
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences.htm

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