https://www.english-4u.de/en/tenses-exercises/present-simple-progressive2.htm
https://www.english-4u.de/en/tenses-exercises/present-simple-progressive4.htm
https://www.ecenglish.com/learnenglish/lessons/present-continuous-or-present-simple-pre-intermediate
https://www.focus.olsztyn.pl/en-present-simple-and-present-continuous-tests.html