GRAMMAR
http://www.statnimaturita-anglictina.cz/present-continuous-pritomny-cas-prubehovy
https://agendaweb.org/verbs/present-continuous/index.html
https://agendaweb.org/exercises/verbs/present-continuous.htm
http://eslgamesworld.com/members/games/grammar/present%20tenses/present%20tenses%20snakes%20and%20ladders.html
http://www.kico4u.de/english/uebungen/5klasse/what.htm
https://agendaweb.org/verbs/present_continuous-exercises.html