Five uses, one condemned, all misanalyzed
Arnold Zwicky recently wrote about the word once in an important post on what he calls "temporary potential ambiguity" (a very useful concept indeed). His target was the strange practice among prescriptivists of deprecating what he calls the "subordinator" use of once, by which he means the use where it is immediately followed by a clause complement, as in Once you've finished the report, bring it to me immediately. The prescriptivists object to that, but don't seem to mind the others at all. I want to refine Arnold's analysis a bit — in a way that only strengthens his general point. He says there are three main uses of once. I put the number at five well-established different uses. And interestingly, if I'm right about them, this word has been completely misanalyzed by all grammarians so far.
The simple version of the traditional position is that once is an adverb, and in the objectionable use it's a subordinating conjunction. I claim all of this is wrong. Neither the traditional grammarians nor the usage purists have managed to get anything right about this multi-talented word.
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