Evidential "ain't" on the hustings
At a rally a few weeks ago in Newport News, Obama criticized McCain's economic program, claiming that the average CEO would get a $700,000 tax break, and then added: "Not only is it not right, it ain't right." Apart from the obvious "just folks" implications of the register shift, the line exploits a subtle distinction in evidentiality that Tom Wasow pointed out to me some years ago, which I worked into a "Fresh Air" piece back in 2002:
A while ago my Stanford colleague Tom Wasow sent me an article from the Chronicle of Higher Education that quoted a dean at a prestigious Eastern university: "Any junior scholar who pays attention to teaching at the expense of research ain't going to get tenure." That ain't was a nice touch: it made it clear that the dean's conclusion wasn't based on expert knowledge or some recent committee report — it was something that should be clear to anyone with an ounce of sense.
That's the message that ain't conveys in all those common expressions like "It ain't over till the fat lady sings" or "If it ain't broke don't fix it" —ain't tells you that you're dealing with a nitty-gritty verity that you don't need a college education to understand.
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