Simple Present

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pres1.htm

http://www.englishmaven.org/HP6/Present%20Tense%20Exercise%206.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=2975

http://www.montsemorales.com/gramatica/PresSimp5.htm

http://www.montsemorales.com/gramatica/PresSimp4.htm

http://www.eflnet.com/grammar/presentagreement.php