http://c3422898.r98.cf0.rackcdn.com/grammar-snacks-the-present-simple.mp4
http://www.englishpage.com/verbpage/verbs1.htm
http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive.htm
http://www.perfect-english-grammar.com/present-simple-present-continuous-1.html
http://www.perfect-english-grammar.com/present-simple-present-continuous-2.html
https://elt.oup.com/student/solutions/preint/grammar/grammar_01_012e?cc=ec&selLanguage=en
http://www.english-4u.de/pres_prog_ex4.htm
https://www.learnclick.com/mchoice/show/849
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