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Monday, February 3, 2014
present perfect grammar
http://www.curso-ingles.com/gramatica-inglesa/present-perfect.php
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple
http://personales.ya.com/mjandres/archivos/GRAMMAR4&5.PDF
http://www.englishpage.com/verbpage/presentperfect.html
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