http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive.htm
http://www.perfect-english-grammar.com/present-simple-present-continuous-1.html
https://www.proprofs.com/quiz-school/story.php?title=present-simple-vs-continuous
https://www.learnclick.com/mchoice/show/849
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/simcon1.htm
https://elt.oup.com/student/solutions/preint/grammar/grammar_01_012e?cc=ec&selLanguage=en
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