People have similar, but different mental capabilities, and different attitude.  I have a superficial knowledge of linguistics and philosophy of language, and am also interested in philosophy, history and literature, so I&#x27;ll be more able at forming rather more coherent, more logical and lenghtier sentences, but not everybody is like me, and they won&#x27;t be able to phrase complex and&#x2F;or ambiguous concepts as clearly as I do.  What I do is that I adjust myself to my interlocutor(s), I try to be comprehensible and relevant to him, from whatever background he shall be.  Because however much I know a language, and however much I be good at speaking it, if I cannot use it for its very fundamental purpose of communication, then all my knowledge and all my quality is useless: better knowledge of a language should <i>expand</i> the amount of people I can communicate to, not decrease.