Languages with deep ergativity (with ergative alignment in behavioral constructions) appear to be less common. The perfective aspect thus displays split ergativity. However, ergativity in its most clearly defined instances is primarily about transitive and intransitive verbs. Recurrent themes in her syntactic research include long-distance dependencies, control/raising, ergativity, and scope. Like many other Indo-Iranian languages, Balochi also features split ergativity. Case-marking is basically accusative; ergativity has not been found. Kashmiri has split ergativity and the unusual verb-second word order. It holds even in languages with a high degree of ergativity. This is because Georgian has yet another level of split ergativity. Pashto is a S-O-V language with split ergativity. This is sometimes taken as an element of ergativity in the language. Polypersonalism has also been correlated with ergativity. This form of optional ergativity is common across the Tibeto-Burman family. Corston-Oliver (1996 & 2002) discuss about the ergativity in Roviana. "Deconstructing Ergativity&colon; Two Types of Ergative Languages and Their Features," Oxford Studies in Comparative Syntax.