Instruct: Classify an Amazon review as either positive or negative.
Query: Your first and last German grammar reference

I've been using Hammer's Grammar (3rd Ed. and now 4th) since I first began learning German and have never been disappointed. It's extremely thorough and provides crystal clear explanations of all points, though most beginners would probably find it to be a bit of information overload if they were trying to use this as their sole instructional text for grammar.If you're studying German, you have to purchase this book; there's no debate. Even if you're a beginner and some of it might seem a little "too" detailed, you'll find yourself more and more glad that you have it there as your German improves.