Is it correct to use a comma before the word "correct" in the following sentences: You get in tonight, correct? Or her name is Mary, correct?

If so, what's the rule for this?

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    I doesn't make sense without the comma - say it out loud without a pause and you'll see. The comma (simplistically) denotes a pause when speaking, and this is shown in print as a comma. – bamboo Jan 1 '14 at 12:06
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    I've not seen an 'authoritative ruling' on this one. This usage is as a sentence substitute, (for 'Is that correct?') – which term Collins defines thus: n 1. (Linguistics) a word or phrase, esp one traditionally classified as an adverb, that is used in place of a finite sentence, such as yes, no, certainly, and never Collins English Dictionary >> So the grammar police could argue that it needs at least a semicolon or dash, if not a full stop and capitalisation. I'm happy with the comma, but that's a minimum requirement. – Edwin Ashworth Jan 1 '14 at 12:36
  • Highly related: english.stackexchange.com/questions/30713/… – Andrew Leach Jan 1 '14 at 18:10

It is a phrase that attaches itself at the end of a regular sentence:

"Her name is Mary." + "right?"

The main sentence is complete in all respects.

The phrase that comes in is "attached" using a comma.

"Her name is Mary, right?"

"right?" here is known as a 'question tag.' Notice that this is always an interrogative (question).

See Wikipedia

A question tag or tag question is a grammatical structure in which a declarative statement or an imperative is turned into a question by adding an interrogative fragment (the "tag"). For example, in the sentence "You're John, aren't you?", the statement "You're John" is turned into a question by the tag "aren't you". The term "question tag" is generally preferred by British grammarians, while their American counterparts prefer "tag question".

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