Just start with the basics;that is,making a ordinary sentence and day by day take a step further. I can suggest you Essential Grammer in Use [Raymond Murphy] third edition. I believe that it will be good start for you.
Basic English Grammar by Betty Azar is excellent. It's a large red book. It is the best in my opinion.
I need some english lessons
Wegen viel Arbeit oder wegen vieler Arbeit?
English speaking practice
The difference between "has + been + p.p" and "had + been + p.p"
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