1. Separate names being addressed from rest of the sentence using a comma or commas.
Examples:
Alan, put your hand up if you do not understand.

("Alan" is being addressed. The word "Alan" is said to be in the "vocative
case". It must separated from the rest of the sentence with a comma.)
Where do you think you are going, you little devil?

(Somebody is being addressed as "you little devil". Those words are in the
vocative case, and a comma is required.)
Absolutely, John, get your skates on.
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VOCATIVE CASE?
When somebody is being addressed directly, his/her name must be separated from the rest of the sentence with a comma (or commas). (Names that are being addressed directly are said to be in the
"vocative case".)
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