In the sentence "They are sweet, not sour, grapes.", is the second comma correct, incorrect, or optional?

1 Answer 1


I would say it is correct, and while it is arguably optional, I think in this case it is better left in, especially because there is an English idiom, 'sour grapes', which roughly means someone speaking or acting negatively due to jealousy.

  • +1 thank you. My question was general and I just happened to choose the reference to "sour" and "grapes". I guess it is optional in general but it is better safe than sorry to leave it in?
    – semantax
    Jul 2, 2014 at 10:15
  • It is a style choice. A rule of thumb is to read it out loud. Where you naturally feel the need to pause, put a comma. You might also read: en.wikipedia.org/wiki/Serial_comma Jul 2, 2014 at 10:16
  • the "naturally feel the need to pause" approach doesn't work for me though. somehow i find pauses natural at way more places than most people :v
    – semantax
    Jul 7, 2014 at 21:36

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