This is a question based on the thinnest of clues: In the future, an Earth man visits a society that has standardized its English so that there are no irregular forms. The characters say "bes" (or "bees"?) and "dos" instead of "is" and "does", "beed" and "doed" instead of "was" and "did". They scoff at the visitor, who speaks our irregular contemporary English. If I remember it right, there were other innovations, some of which made sense and others that were satirical. I don't remember whether this is a society on another planet or in Earth's own future, but I think it was set in the future in a culture that had branched off from Earth's many years ago.
I could have sworn that this was Stanton Coblentz' Next Door to the SunNext Door to the Sun (1960), but I recently found a copy of that novel and it's not. Although it does have a visitor from Earth encountering Mercurites whose language has evolved in amusing ways over the course of five hundred years of isolation, its language does not have the extreme regularity I remember.
I probably read this tale, which I am pretty sure was of novel length, in the 1960s or early 1970s. In English.