This research uses the method of analyzing language sound phonemes to understand how the sounds of Indonesian are organized in its phonological system. The results are expected to provide in-depth insight into the sound structure of this language, support linguistic understanding and contribute to the development of language teaching methods. This research shows that phonemes in Indonesian have twenty-three consonant sounds and ten vowel sounds. The twenty-three consonant sounds are [p, b, t, d, c, j, k, ˀ, g, m, n, ŋ, ñ, l, f, s, z, ʃ, x, h, r, w, y]. Meanwhile, the ten vowel sounds are [a, i, I, u, U, e, ә, є, o, ↄ]. While the nineteen consonant phonemes, namely /p/, /b/, /t/, /d/, /k/,/l/,/g/,/c/, /j/,/s/, /h/, /m/, /n/, ñ/, /ŋ/,/r/, /R/,/w/, /y/.
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