Present continuous vs present simple EXERCICES

http://www.ecenglish.com/learnenglish/present-simple-and-present-continuous

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

http://www.grammar.cl/Notes/Present_Tense_Progressive_Tense.htm

http://www.englishpage.com/verbpage/verbs1.htm