References:
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Leech G., Cruickshank B., Ivanic R.: An A-Z of English Grammar & Usage. Harlow: Longman, 2004.
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Murphy R.: English Grammar in Use. Cambridge: Cambridge University Press, 2006.
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A Linguistic Study of the English Verb, Longmans, 1965.
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Comrie, Bernard, Tense, Cambridge Univ. Press, 1985, pp. 21, 47-48."UltraLingua Online Dictionary & Grammar.
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David Rubin, "might could (double modal)", The Mavens' Word of the Day, Random House, November 20, 2000.
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Fleischman, Suzanne, The Future in Thought and Action, Cambridge Univ. Press, 1982, pp. 86-97.
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Fowler's Dictionary of Modern English Usage (4th ed.). Oxford University Press. p. 853. ISBN 978-0- 199-66135-0.
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Garner, Bryan A. (2003). Garner's Modern American Usage. Oxford University Press. p. 810. ISBN 978-0-19-516191-5. Butterfield, eds. (2015).
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Kenneth G. Wilson, "Double Modal Auxiliaries", The Columbia Guide to Standard American English, 1993.
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