Book excerpt: Speed Up Your German is a unique and innovative resource that identifies and explains the errors most commonly made by learners of German, enabling students to learn from their mistakes while enhancing their understanding of the German language. Each of the eighteen chapters focuses on a grammatical category where English speakers typically make mistakes. Each chapter is subdivided into two levels: Level 1 explains the root cause of the error while level 2 goes deeper into the grammar allowing students to choose the level they want to work at. Each point is clearly explained and exemplified and a range of exercises reinforce learning. Suitable both for classroom use or self-study, Speed Up Your German is the ideal resource for all intermediate learners of German wishing to refine their language skills.