Question

what is question tag ?

Answer 1

A tag question (also known as tail question) is a grammatical structure in which a declarative or an imperative statement is turned into 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".

Answer 2

a question converted from a statement by an appended interrogative formula, e.g. it's nice out, isn't it?.