The simple past.

Exercises to learn the simple past:
To Be.
Pasado simple.
http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-past.php#.UyGge86GfxU
http://www.ego4u.com/en/cram-up/grammar/simple-past
http://www.perfect-english-grammar.com/past-simple-exercise-7.html
 http://www.englishexercises.org/makeagame/viewgame.asp?id=3303
http://www.englishexercises.org/makeagame/viewgame.asp?id=2252
http://www.englishexercises.org/makeagame/viewgame.asp?id=3686
http://www.wikisaber.es/Contenidos/LObjects/Macmillan_scorm5_sco_59/index.html