The process of becoming a fluent speaker in your native language is quite similar to the process I have had to get fluent in stepping to tango music; by communicating with the people around me. After reaching a certain level in your language you start to feel if the words are not in right order or if the verbform is not correct, you don't know why, you just feel that it is not correct. I also developed a feeling indicating that I am relating my steps to music in a good way or the opposite.
Are you with me?! Are you also an intuitive dancer?!