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I think this affects comma placement, right?

If it's an adjective phrase modifying harm, then I think it would be:

"potential, not actual harm"

If it's an adverb phrase modifying potential (by saying it another way, kind of like an appositive, but with an adjective instead of a noun), then I think it would be:

"potential, not actual, harm"

Saying potential another way is really the reason to put not actual in there in the first place, so treating not actual as an adverbial phrase seems to make more sense purpose-wise. Another way of thinking about not actual as an adverbial phrase might be:

"potential (and by that I mean not actual) harm"

However, I'm not really sure, especially since not actual certainly makes sense as an adjective modifying harm, which seems simpler. If a phrase could be seen as modifying an adjective or a noun, maybe for simplicity it should just be seen as modifying the noun?

I guess my possibly crazy-sounding hypothesis is that it's in the middle on some kind of spectrum between adjective and adverb and we should do some kind of primary purpose test to determine which one it is for comma placement? (I can picture English teachers everywhere cringing at that suggestion...) I think this is basically what I was thinking above when I suggested it might be an adverbial phrase. (The mental picture of cringing English teachers everywhere is why I think that suggestion might be wrong.)

Of course, this could be avoided altogether by just saying:

"potential harm, not actual harm"

But that's no fun. :)

So what do you think? Adjective phrase or adverbial phrase?

  • For some more context, this whole phrase is from a discussion on copyright violations. For a fair use defense, if the defendant's actions have a potential harm on the copyright holder, it weighs against a finding of fair use. This factor of the fair use defense is concerned with "potential, not actual harm." For instance, distributing a copied good could potentially displace sales of the original good. The copyright owner would not have to prove actual displaced sales. – Ninjammer Nov 29 '15 at 6:07
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This is an example of hypozeugma in which two phrases (here "potential" and "not actual") are associated syntactically with a single following word (here "harm"). This is rhetorical shorthand for

potential harm [and] not actual harm

This makes actual an adjectival modifier of harm. To get an adverbial modifier for potential, you'd have to say

a not actually potential harm

which is redundant since something that's only potential is not actual.

If the usage is contrasting and emphatic, then a single comma is appropriate. If, on the other hand, the usage is that of an aside (with the meaning of your parenthetical "and by that I mean"), then both commas are the way to go.

  • Wow, I'm officially impressed. – Ricky Nov 29 '15 at 6:30
  • @Ricky I'm sure you know how much that means to me, but let's see if the OP feels the same way. – deadrat Nov 29 '15 at 6:33
  • Who's Hecuba to him ... – Ricky Nov 29 '15 at 6:36
  • What is, not "Who's". – deadrat Nov 29 '15 at 7:01
  • I stand corrected. Actually, is the other way around ... uh ... never mind. – Ricky Nov 29 '15 at 7:12
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It is an adjective. The word actual is an adjective (actually is an adverb). The phrase is similar to: The dark, black cat walked across my porch. However, in your sentence, one of the adjectives is preceded by not, so it is more like (bad example, but just bear with me): The dark, not white cat walked across my porch. Hence, there should only be one comma.

Both of the adjectives apply to the noun, so in your case the harm is both potential and not actual.

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