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Ardón Hernández, Venancia Jacqueline and Linares Coto, Fernando Ademir and Mendoza Magaña, Rafael Edgardo (2017) "The implementation of the audiolingual method to enhance the oral production of the english suffixes “-s” and “-es” of eighth-graders of section “a” at Centro Escolar Guadalupe Retana Herrera in the period I and II during the year 2017". Bachelor thesis, University Of El Salvador.