I have two questions about predicative complements:
1) I've been scouring CaGEL* in pursuit of some kind of survey of forms functioning as subject predicative complement, but have failed miserably; I've found lots of comments as to what forms typically function as subject predicative complement, but no exhaustive discussion of all the forms that actually can function this way. Is there anyone who happens to know of any such discussion/survey?
2) On a more specific note, I'm wondering about the phrase in bold in :
 I am very (much) against the whole idea
What is this?? From a function perspective, it clearly relates to a predicand (the subject I), so I guess it has to be a subject predicative complement, right? But what is it from a formal point of view? It’s like an adjective phrase in that it can be modified by very or very much in the sense 'decisively', but it’s obviously more like a PP in that it contains a complement in the form of a noun phrase (the whole idea), and in that against is listed as a preposition (and once as a conjunction, but never as an adjective) in the dictionaries I’ve checked (Oxford, Cambridge, Merriam.-Webster) – plus, as far as I can see, it's treated only as a preposition in CaGEL. Now, if PPs can’t function as predicatives, I suppose the only possible analysis is to see this phrase as an AdjP, but since I’m not sure they can’t (hence my first question above) I’m still wondering…
*Huddleston, R., and Pullum, G. K., 2002. The Cambridge Grammar of the English Language. Cambridge: Cambridge University Press.