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This paper sketches a grammar of English relative clause constructions (including infinitival and reduced relatives) based on the notions of construction type and type constraints. Generalizations about dependency relations and clausal functions are factored into distinct dimensions contributing constraints to specific construction types in a multiple inheritance type hierarchy. The grammar presented here provides an account of extraction, pied piping and relative clause ‘stacking’ without appeal to transformational operations, transderivational competition, or invisible (‘empty’) categories of any kind.
Ivan A. Sag (Mon,) studied this question.