Present Continuous exercises

http://www.englishexercises.org/buscador/buscar.asp?nivel=any&age=0&tipo=any&contents=present+continuous

http://www.englishexercises.org/makeagame/viewgame.asp?id=1021

http://www.eclecticenglish.com/grammar/PresentContinuous1F.html

http://www.isabelperez.com/happy/tenses/present_cont.htm

http://www.englishtenseswithcartoons.com/present_continuous_exercises

http://www.englisch-hilfen.de/en/exercises_list/zeitformen.htm

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