Reading and observing varies things daily, I noticed that these types of commas are correct, but why? Why are these commas used here:

"I want to meet with you on Sunday, tomorrow."

"I like to help communities, with an emphasis on supporting schools.

"It was a nice day today, on Memorial Day."

Why do these commas make sense, and why do they belong where they belong?

  • 1
    How would the meaning change if the second sentence didn't have the comma? – AmE speaker May 26 '17 at 23:58
  • That's what I'm thinking, but highly-experienced English writers always put the comma there. Why? – The May 27 '17 at 0:34
  • The commas are hardly the problem with the above. – Hot Licks May 27 '17 at 2:16
  • Sunday and tomorrow are in apposition. They are one and the same. Nouns or noun phrases in apposition are separated by a comma. – DebraH May 27 '17 at 14:09

These are non-essential phrases/clauses. According to OWL by Purdue, these non-essential parts need to be separated from the other parts of the sentence.


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