This workbook answers one of the most common questions posed by students of Italian as a foreign language: how do you know which auxiliary verb to choose? Essere (to be) or avere (to have)? The book is divided into two sections. The first provides helpful thematic tables and explanations, and the second presents a range of exercises and activities for ample practice. Ideal for beginner to intermediate students. Answers are included in the back. Text is all in Italian.