Abstract
This paper is an attempt to capture several symmetries and asymmetries between noun phrases and clauses, by extending the so-called DP hypothesis. It is argued that noun phrases are structurally DP with the projection of INFL in it, and that DP has no Spec in contrast to other functional projections. Introducing the projection of INFL into DP makes it possible to provide a simple and principled account for Case-marking, agreement and preposing within DP. The presence of IP and the absence of the Spec in DP have direct consequences for extraction, within the system of barriers proposed in Chomsky 1986b.
