tercer a simple past

http://clicknlearn.net/
http://www.perfect-english-grammar.com/past-simple-exercise-7.html
http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?04
http://www.english-grammar-lessons.com/pastsimple/exercise3.swf
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-8184.php
http://www.englishexercises.org/makeagame/viewgame.asp?id=2355
http://perso.wanadoo.es/autoenglish/gr.pastsim.i.htm