EDITED - My original answer was really off-base!
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AnonymousSo 'is' in all cases?Yes. You have to say is the comma used because the comma is a singular noun. You would say are the commas used.
Grammar GeekI plead excessive mid-afternoon sleepiness. I will take my nap now and return with a clear head later!Pleasant dreams in Technicolor, GG! On a wide screen!