PRESENT PROGRESSIVE VS SIMPLE PRESENT TENSE

http://www.oupchina.com.hk/elt/progress/progressgradedgrammar.pdf

http://www.englisch-hilfen.de/en/download/test_simple_present_progressive2_en.pdf

http://www.hueber.de/shared/elka/Internet_Muster/Red2/3-19-002886-9_Muster.pdf

http://www.perfect-english-grammar.com/present-simple-or-present-continuous.html

http://www.englisch-hilfen.de/en/download/test_simple_present_progressive2_en.pdf

http://www2.hec.ca/rh/formation/langues/Anglais/materiel_pedagogique/inter2/partie4/06_int2%284%29_gram_the_simple_present_and_the_present_progressive.pdf

http://edu.jccm.es/ieso.valledelhenares/attachments/article/138/PRESENT%20SIMPLE%20VS%20CONTINUOUS.pdf

http://www.e-grammar.org/present-simple-continuous/

http://1iek-peiraia.att.sch.gr/2Presents_extra%5B1%5D.pdf

http://migueldecervantesysaavedra.wikispaces.com/file/view/GUIA_29_10_PTESIMPLE-PTECONTINUO_4M_PGN.pdf/272041588/GUIA_29_10_PTESIMPLE-PTECONTINUO_4M_PGN.pdf

http://www.englishteststore.net/index.php?option=com_content&view=article&id=10440&Itemid=437

http://www.selfstudy.cambridge.org/media/36495/9781107699892_units_1_to_5.pdf

http://www.macmillanenglish.com/uploadedFiles/wwwmacmillanenglishcom/Content/International/Greece/New_Smash_3_Grammar_supplementary.pdf

http://www.almablasco.es/wp-content/uploads/2012/10/PRESENT-SIMPLE-VS-PRESENT-CONTINUOUS-EXERCISES.pdf

http://www.eslflow.com/Working_in_a_laboratory_present_continuous.pdf

http://www.eslflow.com/What-are-they-doing.html

http://www.grammarbank.com/simple-present-vs-present-progressive.html

http://www.grammarbank.com/simple-present-vs-progressive.html

http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive2.htm

http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive.htm

http://www.ego4u.com/en/cram-up/grammar/simpre-prepro

http://www.englishpage.com/verbpage/verbs1.htm

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/simcon.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=1438

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/simcon1.htm

http://www.eclecticenglish.com/grammar/PresentContinuous1I.html

http://www.perfect-english-grammar.com/present-simple-present-continuous-2.html

MISCELANIA ( GRAMMAR IN GENERAL)

http://farmacia.unich.it/farmacologia/didattica/inglese/worksheets.pdf