The document discusses tag questions in English. It explains that tag questions are short questions added to statements, especially in spoken English. It provides the rules for forming tag questions based on whether the statement is positive or negative. Tag questions can use auxiliary verbs like "be" and "have" or the verb "do" if there is no auxiliary. Modal verbs are also used in the same form in tag questions. Intonation differs depending on if the tag question is a real question or for agreement. Examples are provided to illustrate the different types of tag questions.