@misc{10818/29141,
year = {2016},
url = {http://hdl.handle.net/10818/29141},
abstract = {By the end of this lesson the student will be able to  to show that something started in the past and has continued up until now.},
publisher = {Universidad de La Sabana},
keywords = {Present},
keywords = {Structure},
keywords = {Verb to be},
title = {Present Perfect Continuos},
author = {Fernández Camargo, Sandra Milena and Parra Pérez, Diana Angélica and Averanga, Alfredo Jose and Corredor Plazas, Nelson Javier and Suárez González, Juanita and Coca García, María Camila},
}