Hi John,
Yes like ''Hi,John" cause you pause a little when you say hi.
yes.....
Yes, you should put a comma after a name followed by "MD" when it appears in a sentence. For example, "John Smith, MD, will be leading the seminar." The comma helps to set off the abbreviation and clarify that it is an additional descriptor of the person.
you would only need to use a comma if you were writing a messege like this ex. Hi Mary, how are you? but if it was a conversation it could be Hi Mary ! ( or period)
Most greetings are considered interjections. Therefore, they are set apart from the sentence with either a comma or exclamation point. For example, "Hello! How are you today?" or "Hi, John."
Yes, a comma is typically used between a name and listing credentials. For example: John Smith, PhD.
The correct punctuation after the word "Hi" is usually a comma. For example: "Hi, how are you?"
you do not have to put the comma there
The comma goes after.
Comma after what?
Yes, you should put a comma after "welcome" when addressing someone by name. For example, you would write, "Welcome, John." The comma sets off the name from the rest of the sentence, following the rules of direct address in English grammar.
Traditionally, a colon for business letters and a comma for personal letters.