Delfino hat geschrieben:I only use my gut feeling and Google to check something.

As a matter of fact, so do I. When I write a correction I first mark all parts of a text that "trip me up". I must have skipped that part of the sentence though, because that would have caught my eye. I would remember if it had, though.
Compared to me you are a so much more knowledgeable person
in regard to the use of the English vocabulary and English grammar.
I always assumed that you've been studying English at university
(like Duckduck, Keswick, George and others). Am I right?
Not exactly, but not very far off. My English knowledge is a result of my special interest in the internal structures of languages. I've also taken courses in general linguistics and computer linguistics at university, though.