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http://www.agendaweb.org/verbs/present_perfect-exercises.html https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple http://menuaingles.blogspot.com/2014/06/diferencias-entre-give-back-bring-back.html https://www.ego4u.com/en/cram-up/grammar/simpas-preper https://www.italki.com/question/217544 http://forum.wordreference.com/threads/take-back-vs-give-back.405746/ http://www.alphaingles.com/2014/08/give-back-bring-back-y-take-back-tres.html http://forum.wordreference.com/threads/bring-back-give-back.1667421/ http://www.eslprintables.com/forum/topic.asp?id=31267 https://learnenglish.britishcouncil.org/en/english-grammar/verbs/present-tense/present-perfect ---------. prahsal https://www.youtube.com/watch?v=dHThTUKIzww check http://www.alphaingles.com/2014/08/give-back-bring-back-y-take-back-tres.html http://menuaingles.blogspot.com/2014/06/diferencias-entre-give-back-bring-back.html https://www.italki.com/question/217544 http://menuaingles.blogspot.com/2...