We see these expressions often. ' He's gone camping ', "He' s been camping'. I know they have slightly different meanings, the second one conveys the experiential one, and the first one suggests we had to travel to somewhere first, before our having this kind of experience. Assume that we want to make these both phrases in the perfect continuous. Only the first one is possible - ' He's been going camping '. I had to do this test for making myself sure whether the second is a possible construction. I believed it is not, and I wanted to get some confirmation about this. I was given such, but explanation is what has been refused to me.
' to have been being + ing ' is the impossible structure.
So, 'being followed by the -ing form' is what makes this construction impossible, or are there some other explanations, such as cohesion or coherence paradox, or self- denying elements in the phrase or whatever ?
I know somehow the answer, but I cannot express it. I have learned philology and I even think of linguistics. I really need to get some help, in order to make it clear for myself. It's like seeing 'never' placed in the adverb position in the present perfect continuous tense. Correct me if I'm wrong, but I've never seen such a sentence.
No matter how complicated or unfamiliar the terminology needed to explain this question might be. I would like to have it.
You may decide not posting this question. Still, I would like to have a private help from somewhere.