http://eslgamesworld.com/members/games/grammar/present%20tenses/present%20tenses%20snakes%20and%20ladders.html
http://www.focus.olsztyn.pl/en-present-simple-and-present-continuous-tests.html#.WrLhDB3OVH0
https://learnenglishkids.britishcouncil.org/en/grammar-practice/present-simple-and-present-continuous