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The article examines two phonetic phenomena of English and Kabardino-Circassian spontaneous speech – assimilation of consonants and elimination of consonants and vowels in the flow of speech. In general, the processes occurring in live speech, if they are not known, can turn into a factor that complicates the perceptual assessment of the utterance. This circumstance results in various kinds of difficulties in communication, especially in a situation of casual communication, a characteristic feature of which is reliance on an incomplete communication style. In the course of the study, the works of authoritative Russian and foreign phoneticians have been analyzed, at-tention has drawn to the overload of the concept of assimilation in the presence of terms that can more accurately describe a certain phonetic phenomenon, an attempt is made to systematize the presented data and answer the question of how regular the phenomena of assimilation and elision are: in English spontaneous speech, assimilation often occurs at the junction of morphemes, and consonant elision occurs with a large confluence (clusters) of consonants, vowel elision occurs in an unstressed position; Kabardian spontaneous speech is characterized by regressive assimilation, the elimination of the vowel at the end of the morpheme.
T. et al. (Sun,) studied this question.