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DOI:
Mavjud emas
[1]. Fries Ch.C.American English Grammar. London. London University Press, P1940-240.
[2]. M e n c h e n H.L. The American Language. New York. The Centure Press. 1963 - P.530.
[3]. Kenyon J.S. Cultural Levels and Functional varietes of English.-Tn.: College English, 1948, 10, Number 1-3, P.47-52.