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If one wanted to say something like

no commas: Hello Pete, how are you?

or

commas: Thanks, Julia, this will be helpful!

would he need commas separating the different elements in the interjection or just the comma separating the interjection from the rest of the sentence/clause?

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marked as duplicate by MrHen, Kristina Lopez, Rory Alsop, Hugo, choster Dec 18 '13 at 8:02

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Commas, especially in the such cases as this, are more a matter of writing style and not of grammar at all. –  Kris Dec 5 '13 at 12:23
    
This refers to the vocative comma. See this related thread: english.stackexchange.com/questions/17651/… –  George Stirling Dec 16 '13 at 10:55

1 Answer 1

up vote 0 down vote accepted

You would need commas before the interjection (if it is at the end of a sentence); before and after the interjection (if it is in the middle), including names; after, if it is at the beginning of the sentence.

Examples:

Celia, would you take that call? (Interjection at the beginning) Will you, Aisha, do that assignment for me? (Interjection in the middle) Yes, Doctor, I will. (Interjection in the middle) I can, if you like, complete the project for you. (Interjection in the middle) I can complete the project for you, if you like. (Interjection at the end) I can do that for you, Alicia. (Interjection in the middle)

You can find more good rules here: http://www.grammarbook.com/punctuation/commas.asp

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What's with these voluntary down votes :) –  Kris Dec 5 '13 at 12:22

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