Satisfying constraints on extraction and adjunction

In this paper, we present a unified feature-based theory of complement, adj unct, and subject extraction, in which there is no need either for valence reducing lexical rules or for phonologically null traces. Our analysis rest s on the assumption that the mapping between argument structure and valence is defined by realization constraints which are satisfied by all lexical h eads. Arguments can be realized as local dependents, in which case they are selected via the head's valence features. Alternatively, arguments may be realized in a long-distance dependency construction, in which case they are selected via the head's slash features. Furthermore, we argue that English post-verbal adjuncts, as well as complements, are syntactic dependents sel ected by the verb, thus providing a uniform analysis of complement and adju nct extraction. Finally, we show that our analysis provides an alternative treatment of subject extraction and we offer a new account of the that-trac e effect.