
http://www.englishpage.com/verbpage/simplefuture.html
http://www.nonstopenglish.com/allexercises/Grammar/Grammar-future.asp
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/fut.htm
http://www.englishpage.com/verbpage/verbtenseintro.html
http://esl.about.com/library/quiz/blgrquiz_futureforms.htm
http://www.autoenglish.org/tenses.htm
http://acacia.pntic.mec.es/agip0002/auro/inicio.html