A
question tag or
tag question (also known as
tail 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".