"We never use 'you-all' in the singular.

Not even the most ignorant do so.

But, as you know," (Ah, that was mercifully said!) "there are some peculiar, almost unexplainable, shades of meaning in local idioms of speech, which are not easy for a stranger to understand.

I have a friend who was reared in Milwaukee and is a graduate of the University of Wisconsin, who tells me he would have argued the 'you-all' point with all comers for some years following his taking up his residence here, but he is at this time as ready as I to deny the allegation and 'chaw the alligator.' "When your young lady, in Virginia, asked, 'Do you-all take sugar ?' she mentally included Mr.Morgan, and perhaps all other Yankees.

I would ask my local grocer, 'Will you-all sell me some sugar this morning ?' meaning his establishment, collectively, although I addressed him personally; but I would _not_ ask my only servant, 'Have you-all milked the cow ?'" And that is the exact truth.
I was absolutely wrong.