As part of these templates, the alternation (apophony) between high vowels (e.g. i, u) and a low vowel (a) in verbal forms is usually described as one of the main characteristics of AA languages: this change codes a variety of different functions.
æz pˈɑːɹt ʌv ðiːz tˈɛmpləts, ðɪ ˌɔltɚnˈeɪʃən ɐpˈɑːfəni bᵻtwˌiːn hˈaɪ vˈaʊəlz ˈiː.dʒˈiː. ˈaɪ, jˈuː ænd ɐ lˈoʊ vˈaʊəl ɐ ɪn vˈɜːbəl fˈɔːɹmz ɪz jˈuːʒuːəli dᵻskɹˈaɪbd æz wˈʌn ʌvðə mˈeɪn kˌæɹɪktɚɹˈɪstɪks ʌv ˌeɪˈeɪ lˈæŋɡwɪdʒᵻz: ðɪs tʃˈeɪndʒ kˈoʊdz ɐ vɚɹˈaɪəɾi ʌv dˈɪfɹənt fˈʌŋkʃənz.