In general, NP's, AP's, and PP's can be used as predicatives, but this paper shows that there is a preference for NP over AP and AP over PP when
as introduces a predicative under matrix verbs such as
regard. We try to account for this preferential hierarchy within the framework of the ‘extension theory’, proposed by Kajita (1977, 1983a, b, c). We propose that
as predicatives are prepositional phrases. It is argued that preferential hierarchy follows from the principled hypothesis on PP's that P NP is basic, while P AP and P PP are derivative.
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