Beginners English Grammar Books
The best Beginners English Grammar Book is the "Murphy".
It is written completely in English. It breaks the language down to the very simple building blocks. One page explains the grammar rule. The next has exercises. This makes it very useful to work through the book page by page.
It is not something that should be used on its own. It is better to read other books as well so that you are exposed to lots of language. At this stage it is almost impossible to understand it all but if you keep going back and checking through the grammar book you will find that things that made no sense at all will have fallen into place.
The German Edition
There is also a German edition with extra examples explained in German. Most teachers would advise taking the plunge and chosing English only but if you absolutely must it is possible to buy in dual language. It is still very unlikely that you will understand one hundred percent of what is going on even with the German explanations.