Thank you for your comments.
After reading what I wrote again I found several mistakes about the use of person (I mixed first and third person in what should have been third person), it will be corrected in the final draft.
I suspect my english was better than this in the past, but it has been more than 5 years since I had to use it on an everyday basis to write or to speak, and then it was for a short period of time (2 months or so), I still keep reading (of course) and you hear spoken english everywhere even in a country like Colombia. So yes, stricture and grammar are big problems for me