http://www.agendaweb.org/verbs/present-continuous/index.html
https://learnenglishkids.britishcouncil.org/en/grammar-games/present-simple-and-present-continuous
http://www.eslgamesplus.com/action-verbs-present-progressive-grammar-game-rally-game/
http://enjoyenglish.free.fr/english/college/ing6/pages/ing1.htm