This document provides guidance on properly forming tag questions in English. It notes that tag questions are used to confirm or clarify what someone has said by adding a short question at the end of a statement. Some errors to watch out for include matching the tense and polarity of the statement when forming the tag question and using the correct pronoun in the tag. It advises readers to review the structure rules for tag questions, read carefully, and ensure the statement and tag have consistent tense and polarity and the appropriate pronoun is used.