What about the famous “double modal”...
might could - “I might could go to the store today”
might should - “He might should apologize to her for that”
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As an aside, I am reading a historical fiction written in England in the 1800s. In it, the author has used “I reckon” many times. I thought that was pretty neat. I’d read before that southern English has some traces of older British English - especially in areas like Charleston and Savannah
What’s really wierd is how similar the Charleston, SC and Charlestown, MA accents are. Most people think of Yankee v Dixie as being opposite, but it’s more like they grew in opposite directions. When you get to the real, real, old (”thick”) accents, they start growing more similar.