SIMPLE PRESENT

http://www.englishpage.com/verbpage/simplepresent.html

http://www.ego4u.com/en/cram-up/grammar/simple-present/form/exercises

http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_mix.htm

http://www.englisch-hilfen.de/en/exercises/tenses/be3.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=1052