MODAL VERBS - DEDUCTION IN THE PRESENT & PAST
http://www3.telus.net/linguisticsissues/ModalsPast.htm
http://www.oup.com/elt/global/products/naturalenglish/int/a_grammar/unit11/neint_grammar11_3/
http://www.oup.com/elt/global/products/naturalenglish/int/a_grammar/unit11/neint_grammar11_exp/
http://www.english4all.pro.br/LEpastmodals.htm
http://www.englishpage.com/modals/modalintro.html
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