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Monday, February 3, 2014
present perfect & past simple
http://www.ego4u.com/en/cram-up/grammar/simpas-preper
http://www.aulafacil.com/Ingejerc/Lecciones/Lecc20.htm
http://www.englishpage.com/verbpage/verbs5.htm
http://www.curso-ingles.com/ejercicios-test-ingles/present-perfect-past-simple.php
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