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I used to really like the practice makes perfect books - but the German one is very unclear and will jump into new grammar with no explanation. Exercise 5.2 for instance asks for indirect nouns in the accusative. With no explanation prior to this.
The quality of the pages in the book is also quite poor.
Definitely not a stand alone learning book, but I could see it being a good compliment to an actual course. You should have some understanding of German before using this book. I like how you can write in the book to do the exercises. It was difficult to figure out the grammar rules that go along with the exercises as they aren't explained well or at all in some cases. Everyone learns differently and if you are taking an actual German language course I could see this being a useful tool.
This is easily one of the least useful language books I've tried to use. It is a huge step back from the first edition of this book, which was quite useful. For example, one of the early lessons asks you to translate from English to German sentences that include plural nouns (before learning anything about the plural) and verbs like "to like" and "to buy" before you even learn "I am" or anything about verbs at all. German is not easy generally, but this makes it much more frustrating than it needs to be.
The book content is fine, I like you can use the app with each chapter. The physical book was damaged upon arrival including the bends all along the spine and when I opened it about 1/3 of the cover is not attached to the spine at all.