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Day 281: Place commas around the name of a person whom you are addressing.
Whenever you are writing to a person and using that person’s name, you will need to separate the name from the rest of the sentence with commas. In these cases, the name is being used as an expletive, and expletives are always set apart with commas. Consider these correct samples.
“The problem, John, is that you are lazy.”
“Susan, I see that you have learned to use e-mail.”
“This funding cycle, Madam Chair, is about to begin.”
“I met your sister, Susan.”
[The fourth example has a problem. Is “Susan” the name of the sister or the name of the person to whom you are writing? Because you are writing to the person, he or she will know the difference. In either case, the comma is correct.]