https://elt.oup.com/student/solutions/preint/grammar/grammar_01_012e?cc=global&selLanguage=en
http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive2.htm
http://www.learn-english-today.com/lessons/lesson_contents/exercises/present-simple-cont-gapfill1.htm
http://www.englishpage.com/verbpage/verbs1.htm
http://a4esl.org/q/h/vm/sp_or_pc.html
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