http://www.admc.hct.ac.ae/hd1/english/narrate/narrtense.htm
http://www.eltbase.com/vtr_refs.php?id=201
http://elt.oup.com/student/englishfile/upperint/a_grammar/file02/nef_upperint_grammar02_b01;jsessionid=93C821A69022903F87ECAC698B84DC26?cc=global&selLanguage=en
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