At school, I was taught the traditional grammar rules that stated that it was correct to say "as if it were" instead of "as if it was" and that "Do you mind if I" was always to be followed by a past-form verb rather than the present-form one.
However, the more I am exposed to the daily English, the more I hear "as if it was" and questions like "Do you mind if I go there?"
So, my question is: what is grammatically correct, is it
"Do you mind if I go there?"
"Do you mind if I went there?"