In this paper, we will consider the status of two types of PP subjects in [Spec, TP]: inverted PP in locative inversion and non-inverted PP in PP subject constructions. On the basis of the assumption that the syntactic expression can be determinable under the meaning of the verb (Levin & Rappaport 1995), we will propose Unaccusativity Condition in order to explain the status of PP subjects. This condition claims that PPs in [Spec, TP] that denote a time, place, or manner are restricted to unaccusativity status of the verb. This functional approach provides us with a unified analysis of two kinds of PP subjects in [Spec, TP].