PAST SIMPLE vs. PRESENT PERFECT

http://www.gimnazija-klasicna-salezijanska-ri.skole.hr/upload/gimnazija-klasicna-salezijanska-ri/multistatic/6/g2g_inter_unit14grey.pdf

http://www.autoenglish.org/tenses/gr.perf.pdf


http://fdslive.oup.com/www.oup.com/pdf/elt/catalogue/0-19-431519-3-d.pdf?cc=global&selLanguage=en

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

http://www.prolinguaassociates.com/Grammar_Review_Book/GRB_Unit_18.pdf

http://www.ihworld.com/ihjournal/articles/10PRESPERFECT.pdf

http://www.english-grammar.at/worksheets/tenses/t25.pdf

http://www.pearsonlongman.com/totalenglish/pdfs/downloads/pre-intermediate/preint_unit02_grammar03.pdf

http://www.perfect-english-grammar.com/support-files/present_perfect_or_past_simple_2.pdf

http://www.englishforeveryone.org/PDFs/Present%20Perfect%20Tense.pdf

http://www.bbc.co.uk/worldservice/learningenglish/flatmates/episode18/languagepoint.pdf

http://www.themlc.org/sites/9290fbae-86dc-4ed1-9fc8-7bfabe4766ba/uploads/5-6present_perfect_CD--id-.pdf

http://www.sprachenshop.de/sixcms/media.php/811/BusinessGrammarBuilder.pdf