¿Magisterio? ¡Estudia algo serio! I want to be a teacher ! Are you joking?

http://reglasdeortografia.com/index.php

http://www.englishmedialab.com/GrammarGames/New_Snakes_%20Ladders/Past_simple_tense.html

http://www.englishmedialab.com/pronunciation/regular%20past%20pronunciation%20ending%20sounds.htm

http://learnenglish.britishcouncil.org/en/big-city-small-world/series-2-episode-7-alone-christmas