Detail #214: A Complication with regards to Predicative Possession

One of the ways of forming predicative possession (i.e. "I have an apple") is by a kind of locative circumlocution: "by me is an apple". In some languages, the apple is the actual grammatical subject, but in some it's not - quirky case can permit for non-nominatives to be subjects. We'll assume case marking is done by affixes in the language we're making up.

Now, we might want to have a way of forming participles and gerunds and whatnots from the predicative possessive usage, yet we probably don't have any particular voice for it. Normally, a noun that is an argument of a clause will take the case marker for the clause in which it is an argument, i.e. you won't say

"by the something-being man"

when you mean to say

"the man by whom something is"

Of course, if we have adpositions, we could do something like

"the something by-being man"

but since we're doing this by cases instead, we would need something else to carry the case. (Or, we'd need to break the assumption that case pertains to the grammatical environment outside the noun phrase.)

So, we go down the route of having being and been and so on pertain to possession, and we come up with separate solutions for the copula sense of the verb. Here we introduce some nice possibilities: we could have specific lexemes meaning being (participle), being (gerund) and been and so on. We could even derive them in somewhat odd ways: maybe if we have a noun meaning 'capacity (as in in the capacity of ...), role, office (as in a position within some organization), title, stature' we could derive the gerund from that: "roleness", "officeness". The present participle might be derived from the verb in some way - thus-being?

So, at this point we have a situation where:

be.GERUND illicit substances can lead to problems with the law →
having illicit substances ...

And to express, say 'being a nurse is no cakewalk' you'd go for 'roleness of nurse is no cakewalk'. 

I haven't really dealt with the past tense participles here, but dealing with that is left as an exercise for the diligent reader.

A further idea though: extend this thing to other verbs where you let the non-nominative subjects lead to slightly other meanings. Have various periphrastic constructions form the equivalent of gerunds and participles.