Использованные источники
Carter Ronald, McCarthy Michael. Cambridge Grammar of English: A Comprehensive Guide Cambridge: Cambridge University Press, 2006. – 983 p. ISBN 0-521-67439-5.
McColl Millar R. (ed.) Trask’s Historical Linguistics 3rd edition. – London, New York: Routledge, 2015. – 432 p. – ISBN: 978-1-315-72805-6 p129.
Виллис Дейв, Райт Джон. Основы английской грамматики. – Harper Collins Publishers, 2004. – 236 c. – ISBN: 5271077004.
https://oldenglishteaching.arts.gla.ac.uk/Units/3_Description_of_OE.html
http://random-idea-english.blogspot.com/2014/01/a-brief-history-of-tense.html
https://en.wikipedia.org/wiki/Grammatical_tense
https://en.wikipedia.org/wiki/Shall_and_will
http://homes.chass.utoronto.ca/~cpercy/courses/6362-lamont.htm
http://www.arrantpedantry.com/2014/12/01/celtic-and-the-history-of-the-english-language/
https://learnenglish.britishcouncil.org/en/english-grammar
https://www.englishclub.com/grammar/
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