In this case, the comma doesn't make a difference to how the sentence is read. But, technically, it does have a function.
"Good morning, everyone" is preferable (to me). You are addressing everyone.
"Tom is leaving, Jane." You are addressing Jane.
"Tom is leaving Jane". You are not addressing Jane.
With your examples, there is no distinction like this to be made.
Crossed with Piscean. I still like the comma.
Sorry, "addressing" means "talking to".
You don't need to distinguish between the two similar 'Jane' sentences, because "Good morning everyone" is unambiguous whether you use a comma or not. However, I believe that that is not a reason to leave it out.
Could you explain me better your sentence, please? What does "They are distinctions you don't need to understand" mean?Yes
(but only insofar as is consistent with the distinctions I've made.) They are distinctions you don't need to understand.
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