6 The fused relative construction
An initial illustration of the range of constructions belonging to the fused relative category is given in : SIMPLE SERIES -EVERSERIES i a. I spent what he gave me. b. I spent whatever he gave me. ii a. I gave him what money I had. b. I gave him whatever money I had. iii a. I’ll go where you go. b. I’ll go wherever you go.
On one dimension we have a contrast between the simple series and the -ever series, the latter being marked by a relative word ending in -ever. Cutting across this is the major category contrast: the fused relatives are NPs in [i-ii], PPs in [iii]. And within the NP category we have a further distinction according as the relative word is a pronoun, as in [i], or a determinative, as in [ii]. (CGEL,p.1068)
Considering that they are calling before in this sentence, I saw him before he left, a preposition (p.58), I can tell why they are calling the clause, where you go: in [iii], prepositional. What I want to know, now, is, if there are any persons other than the CGEL’s writers who call this where usage a preposition. Are there any others?