с фонетикой языка ответы на вопросы : 1) articulatory and acoustic characteristics of vowels. the division into monophthongs, diphthongs and diphthongoids. classification according to the position of the bulk of the tongue and the height of the raised part of the tongue;
2) classification according to the lip position, the length of the vowel, the degree of tenseness and the character of the end;
3) the problem of diphthongs viewed by phoneticians o. jespersen, l. v. scerba, d. jones.
diphthong shift. vowel sequences with /ə/ termination /aɪə , auə/. smoothing as an adjustment related to sound deletion;
4) general mistakes of vowel articulation russian learners of english tend to make;
5) the reduction phenomenon. 3 degrees of the reduction of strong vowel forms: quantitative, qualitative and zero reduction. elision of schwa in casual style of pronunciation.
6) accommodation: positional length of vowels, nasalization of vowels, vertical and horizontal movement of the tongue.

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