A teacher in Oakley, Vermont, noted a curious construction among his students while teaching in Maine. They would say things like “We’re all going to the party, and so isn’t he” or “I like to play basketball, and so doesn’t he.”  Primarily heard in eastern New England, this locution has a kind of internal logic, explained in more detail at one of our favorite resources, The Yale Grammatical Diversity Project. This is part of a complete episode.