This document discusses tag questions, which are short questions added to statements to seek confirmation or agreement. Tag questions are formed by adding an auxiliary verb and a pronoun to the end of a statement. The auxiliary and pronoun in the tag question are opposite in polarity from the main statement. For example, a negative statement would take a positive tag ("She isn't coming, is she?") while a positive statement takes a negative tag ("You are coming, aren't you?"). Tag questions can be used to check information, express certainty of shared knowledge, or disagree with a statement in a polite way.