Analysis of teaching teaching techniques that influence positively the improvements in the four english skills, among students of third year "F" in the morning shift at Rigoberto Lopez Peréz´s school during the first semester of 2016 - Ruíz Carrión, Raúl | Hernández Oporta, Darlyn | Ruíz, Karla Vanessa Ruíz Carrión Raúl (UNAN, Managua, Nicaragua, 2016)