'Hello Mark, how are you?'
Should that then be
'Hello, Mark, how are you?'
Actually, Hi, Mark and Hello, George don't look at all strange to me (though Dear, Betty does). Part of the story here is (I think) that we now, in general, use less punctuation than was fashionable formerly. I also suspect that we're more inclined these days to make punctuation follow intonation.It would be unusual to begin an email or letter with:
Yet I would insert a comma after "hello" elsewhere if I intended it to reflect a change in intonation.
Since we can't hear capital letters, everyone listening to the first sentence might get out their pencils and make a mark on something.For me, there's a huge difference between "Please Mark, please," and "Please, Mark, please." The first asks "Please give pleasure to Mark," while the second entreats Mark twice.
If i were saying the below sentence, would I put a comma before the name?
'What are you saying Mark?'
Should it be:
'What are you saying, Mark?'
Yes, Dr. Max, you may always concur with some here, especially with me.May I concur with some here? The use of the comma, as robrecht (are you related to ruprecht?) notes, is what indicates that you are addressing a person ("direct address" and "vocative" meaning roughly the same) rather than using using the word is some other grammatical form, such as a modifier.
So, "Please Mark" might be understood (as noted above) as the imperative, "I am ordering you to please Mark!", which may have salacious implications and would only be useful if you're writing in the erotic mode.
Inserting the comma makes it clear that you are addressing a person named Mark, and that whatever goes before or after his name in the sentence does not act as a modifier of his name.
Also as noted, in short informal usage, "Hello Mark" might not be objected to, since no reader is likely to believe that "hello" modifies "Mark" but is readily almost always seen as a form of greeting. But I'd put the comma in anyway since it signals to the reader that this situation is in the state of vocativity (I just made that word up).