Yes, you ought to, anyway.
No, the sentence "Thank you John" is not grammatically correct. It should be written as "Thank you, John." Adding the comma after "thank you" separates the person's name as an interjection in the sentence.
Not usually : "Thank you for listening to me" does not need a comma. However, if you write their name afterward ("Thanks, Fred."), you need a comma after thank you.
The phrase "Thank you, teachers" is appropriately punctuated with a comma after "thank you" to separate the expression of gratitude from the noun that follows.
Not necessarily. I want to thank you for helping me last night. A comma would wrong here. "Thank you," said Sam. There is a comma here, but it is not because of the words "thank you." You would write: "I want ice cream," said Sam. Thank you usually stands by itself or with an appellation. "Thank you, Sam!" In this case, the comma is there to set off the appellation, not because you used the words thank you. For example, you would write: "Go screw yourself, Sam!" or "Sam, thank you so much."
it depends where its at in a sentence
Adding a comma is perfectly proper, but not compulsory. In speech, adding a tiny pause between 'you' and 'Jim' tells him that you really are grateful. When writing, a comma signals that little pause.
When you address someone directly, you offset their name or pronoun with a comma(s). "Joe, please give me a hand." "I'll be there in a minute, Mom." "Thank you, Peter."
No.
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You do not need a comma before "as needed" or "as directed." These phrases are typically used as adverbial phrases in a sentence and do not require a comma to separate them from the rest of the sentence.
Yes, you do. For example, "Thank you, staff and parishioners."
It's "Thank God for good memories, family, friends, and traditions." These are serial commas, otherwise known as Oxford commas. (There is some debate about the comma that goes before "and" in a series, but most people now agree it should be there.) If "Thank God" is an interjection, it would require a comma after it, but it's not an interjection here.