http://www.englishmedialab.com/GrammarGames/present%20tenses/daily%20routines%20and%20time.html
presente simple afirmativa:
http://www.wikisaber.es/Contenidos/LObjects/Macmillan_scorm1_sco_25/index.html
http://www.wikisaber.es/Contenidos/LObjects/Macmillan_scorm1_sco_26/index.html