So, does anyone want to attempt an explanation as to why класть—положить are a pair.
I know that textbooks often state that there are pairs that are "just", for no good reason different, e.g., говорить—сказать/ брать—взять.
But if you look at the history of the words, than it's not actually true what the authors say. In fact, сказывать is the old imperfective of сказать and взимать is the old imperfective of взять.
So, my question is: what pair-shift happened that caused класть—положить? I know that ложить exists (at least colloquially), and кладывать seems to exist on wikislovar.