ɹᵻsˈɜːtʃ kəndˈʌktᵻd baɪ stˈiːvən ˈeɪ. mˈɑːɹlɪt ænd vˈɛlmə bˈiː. pˈɪkɪt sədʒˈɛsts “ðæt fɔːɹ sˌʌm vˈɜːbz ðə kəmplˈɛɾɪv ænd pətˈɛnʃəl ˈæspɛkt pɹˈiːfɪksᵻz ɑːɹ ˈædᵻd æɾ ɐn ˈɜːlɪɚ stɹˈɑːɾəm ðɐn fɔːɹ mˈoʊst vˈɜːbz”.
Research conducted by Stephen A. Marlett and Velma B. Pickett suggests “that for some verbs the completive and potential aspect prefixes are added at an earlier stratum than for most verbs”.