Grammar Guidebook is the first ever Spanish language text to teach non-binary and gender-neutral language. It is an invaluable resource for intermediate and advanced learners that offers concise explanations and exercises for all major clausal structures, tenses, and moods. Along with including non-binary and gender-neutral language, the volume also incorporates the voseo, or the use of vos as a second-person singular pronoun that is common in many Latin American countries. This book expands the scope of traditional grammar instruction by including reading, writing, discussion, and independent research tasks that support the development of the competencies necessary to thrive in an increasingly interconnected and diverse world. Sin fronteras is suitable for independent study or for supplemental use in conversation classes, classes for heritage speakers, classes with a focus on the professions (e.g., medical Spanish, Spanish for business), and literature classes.