A question tag is a declarative statement 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".
frequently used in spoken English when you want s.o. to agree or disagree. They can be an indicator of politeness, emphasis or irony.
Form:
positive statement ->question tag negative - You are Tom, aren't you?
negative statement->question tag positive - He isn't Joe, is he?
