Hammer's German Grammar and Usage
The definitive English-language reference grammar of German, for when you need the real rule.
BooksPaidAdvancedB2–C2
What it actually is
Martin Durrell's Hammer is what university German departments use: exhaustive, precise, with attested examples and explicit notes on register and regional variation. It answers the edge cases every learner grammar waves away. It is a reference, not a course — dense, expensive, and useless for practice, so buy it only once you're past B1 and the shallow explanations have started failing you.
What it covers
- Grammar
- Writing
- Reading