Question tags
This textbook excerpt focuses on English grammar, specifically the usage of question tags. It explains how question tags are used to seek information, confirm statements, and engage in informal speech. The excerpt provides rules for constructing question tags based on whether the main clause is affirmative or negative, and the correct auxiliary verb to use in the tag. Examples are provided throughout to illustrate the correct usage of different verb forms and auxiliaries in question tags. The exercises provide practice in forming question tags to check comprehension.