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.
How I write a sentence with preposition at the end?
Que est que l´elision la elision?
In polite structure change the sentence.
Find a word wich is similar in meaning to(i)deadly(ii)destructive
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