If you are interested in further practice, here there are some links:
http://www.english-zone.com/verbs/myschedule01.html
http://www.speakspeak.com/html/d3a20_english_grammar_present%20simple_tense.htm
http://www.inglesmundial.com/B4/grammar.htm
http://www.english-room.com/4_01.htm
http://english.baladre.org/sedaviwebfront/presimfreq.htm
http://www.oup.com/elt/global/products/naturalenglish/elem/a_grammar/unit04/ne_elem_grammar04_1/
http://www.angelfire.com/wi3/englishcorner/grammar/Interactive/advfreq1.html
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