Present Simple

SIMPLE PRESENT
Explanation:
http://www.aprenderinglesfacil.es/2008/03/presente-simple-simple-present-tense.html
http://www.englishpage.com/verbpage/simplepresent.html
EXERCISES:
http://www.aprenderinglesfacil.es/2008/03/ejercicios-presente-simple-simple.html
QUIZ:
http://www.englishclub.com/grammar/verb-tenses_present_quiz.htm
http://esl.about.com/library/beginner/bl_bgpressimple.htm
http://www.usingenglish.com/quizzes/65.html