I've heard American English speakers ask – very informally – Who all's playing?
I've heard "Who's all finished?" (all = completely). But I haven't heard "Who's all playing."And I've heard/used "Who's all ..........". (AmE)
American writer, singer, and thought leader Kinky Friedman notes that y'all is singular — the plural is all y'all.
When I lived in New York, it was often yous or yiz.Now that I actually think about it, I'm not sure if I say "who's all" or "who all's". I may even alternate, but regardless, between the two they're fairly common in AmE.
I've heard some claim that the "proper" plural is "all y'alls". I tend to just use "y'all" like 'you' - singular and plural.
It's extremely common in my area.
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