Estes, RobertArgudo Vicuña, Rafael2014-06-272014-06-271982http://dspace.ucuenca.edu.ec/handle/123456789/16005application/pdfspaopenAccesshttp://creativecommons.org/licenses/by-nc-sa/3.0/ec/GramaticaEnseñanza Del InglesChronological development and classifications of irregular verbs in englishbachelorThesis