Re: As a writer publishing on Amazon
The problem lies with English grammar rules, they are not spelled out as they sound, as many languages do. There are also no simple rules on how English is used.
Then there are all manners of varieties of the English language.
https://sites.google.com/a/sheffield.ac.uk/all-about-linguistics/branches/varieties-of-english/what-is-varieties-of-english
https://en.wikipedia.org/wiki/List_of_dialects_of_the_English_language
So this might not be my grammar, it might be your local version of English confusing you. I keep things mostly English - UK standard as I can and trying to avoid spillover from English - U.S variant.