This textbook boosts the confidence of persons teaching Spanish as a second language, who may lack confidence in their understanding of tricky areas of expression. Their previous training did not enable them to control (much less explain to others) the many “danger zones” which challenge graduate students serving as teaching assistants, in-service teachers, and others who use Spanish professionally. It offers original and insightful analyses, abundant examples and helpful English comparisons. It dismantles the machinery of grammar into manageable parts. It is not intended for those wishing to learn Spanish (since it skips the basics to focus on the “rough spots”), but for those who know Spanish well, yet need to overcome their nagging limitations in crucial areas, e.g. subjunctive, reflexives, pronouns (neuter, relative, personal), adjective placement, ser/estar, preterite/imperfect, commands, gender, passive and impersonal expressions. There are special sections on words easily confused with each other, use of the accent mark, irregular verbs, and sentence structure. It is ideal for self-study or to supplement courses in composition, culture and Spanish linguistics. It benefits native-speaker teachers unfamiliar with the “why” of their language. The result is a better prepared teacher and a more promising learning experience for the students.