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DOI:
Mavjud emas
1. Fries Ch. C. American English Grammar. London. London University Press, P. 1940-240.
2. M e n c h e n H.L. The American Language. New York. The Century Press. -1963. - P.530.
3. Kenyon J.S. Cultural Levels and Functional varieties of English.-Tn.: College English, 1948, 10, Number 1-3, P.47-52.