I just saw two sentences like
Doing this is right. Or is it?
To me it looks like the first sentence rephrases a common belief while the second announces the belief to be proved wrong later. Am I right?
The strange thing about this construction is that both sentences are positive. Logically I'd expect the question to be something like "Or maybe is it wrong at the end?" - this way it could be expressed e.g. in German. Is there an explanations while the English construction goes "the other way round"?
OK, it's metanoia, but I'm still stuck with the exact phrasing. Nowhere I've seen this form. Would a phrase like
Doing this is right. Or isn't it?
be correct as well and mean the same?