The grammar explanations are very clear, straightforward and succint. It's oriented toward practice, with lots of exercises. I found this grammar very user-friendly, both in terms of finding topics and of understanding concepts. It is invaluable help for anyone studying German! However, I do not suggest it as the first and only source for beginners, as the explanations may be unclear to those with no previous knowledge of German. Finally (which may be a problem): the key to the exercises is not included with the book, but has to be purchased separately.
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