The default mechanism which assigns this value is only invoked when the structural mechanism is not applicable. While the default Case in English is accusative, it is nominative in most languages. Typical cross-linguistic default Cases are Nominative or Genitive, though the value of the default Case can vary from one language to another. This is to say, if a particular Noun Phrase is not assigned a Case in association with some specification in some other part of the grammar, then default Case assignment principle can apply. For these languages default Case meets something that has become known as the Case Filter (Rouveret and Vergnaud 1980). There are some languages which require that all Noun Phrases have Case. The default Case is a common phenomenon in Universal Grammar (UG). © 2016, Australian International Academic Centre PTY LTD. The post-verbal DP is assigned nominative Case by the C-T complex while the preverbal DP is assigned accusative lexical Case in the presence of the over Case assigner inn or default nominative Case in the absence of inn. However, in SVO structures introduced by the complementiser inn, there are two DPs a post-verbal DP and a preverbal one. Besides, preverbal DPs in SVO structures undergoes movement from to and leaves a resumptive pro(nominal in which appears as either an overt number marker cliticized onto the verb or as a covert pro(nominal). That is, in VSO structures in NA, nominative Case is assigned by the C-T complex via an Agree relation established between T and the subject in while accusative Case is a reflex of an Agree relation between the light v and the object DP. Furthermore, the study examines structural Case assignment in VSO and SVO structures and points out that structural Case in NA is assigned via an Agree relation between a probe and a goal within a c-command domain. It attempts to present a straightforward answer to the following questions: (i) how is structural (nominative and accusative) Case assigned in NA, given the recent developments and challenges in Chomsky’s (2001, 2005) Agree theory?, and (ii) how are Case and agreement features valued in NA syntax? A closer examination of structural Case in NA demonstrates that, unlike Standard Arabic, NA has an abstract Case system which is not morphologically realized, a similar phenomenon to that of English. This study aims to examine structural (nominative and accusative) Case assignment in Najrani Arabic (henceforth, NA) and in turn provide a satisfactorily unified account on how structural Case is assigned in Najrani Arabic within Chomsky's (2001, 2005) Agree theory.

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