No it can't, unless someone is spelling it out, or singing it in a song where it is given two notes, or just hyper-correcting their speech based on their knowledge of writing.
Annoyed speech and such can break words into their morae for empahsis, which breaks up dipthongs.
E.g. angry Japanese five-year-old:
ga kkō ni i ki ta ku nā i!!! (I don't wanna go to school!!!)
"nā i" is not the regular way of saying "nai". The idea that "nai" has that as an alternative pronunciation is a strawman.
No it can't, unless someone is spelling it out, or singing it in a song where it is given two notes, or just hyper-correcting their speech based on their knowledge of writing.
Annoyed speech and such can break words into their morae for empahsis, which breaks up dipthongs.
E.g. angry Japanese five-year-old:
ga kkō ni i ki ta ku nā i!!! (I don't wanna go to school!!!)
"nā i" is not the regular way of saying "nai". The idea that "nai" has that as an alternative pronunciation is a strawman.