I am always confused with these two. As 가, being used as subject particle, is of no meaning at all, I wonder what are the differences in meaning or usage.
I usually see 지 않다:
그녀는 예쁘지 않다. 넌 가지 않을 수 없다.
But I also, sometimes, see 지가 않다: 대답은 왜 들리지가 않나요?
What noun particles can be attached to negatory -지? I had such a thought because of this question.
Any clarifications are much appreciated.