Page "African American Vernacular English" Paragraph 21

* Reduction of certain diphthong forms to monophthongs, in particular, is monophthongized to except before unvoiced consonants ( this is also a feature of many Southern American English dialects ).

The vowel sound in boil ( in Standard English ) is also monophthongized, especially before, making it indistinguishable from ball.

Conversely, older speakers in some regions ( such as the American South ) may use in words like coach and road that have in SE ( i. e., ).