摘要：This study aims to examine the null pro subject in Najdi Arabic and directly answer the following questions within Holmberg’s (2008) theory of null subjects: (i) Is Najdi Arabic a pro-drop and hence a consistent null subject language (NSL)? and (ii) How is the null pro subject derived and interpreted in the syntax? We argue that Najdi Arabic is pro-drop and hence a consistent NSL and that full agreement are associated with null subject pronouns. Furthermore, we reveal that the null subject in Najdi Arabic is derived by incorporating a subject pronoun in the head T position as a consequence of Agree. The interaction between Holmberg’s analysis and Najdi Arabic data reveals that the subject pronoun in Spec-vP configuration is not pronounced in Najdi Arabic because it is not the highest chain copy; what has to be articulated of the subject chain is a verbal affix on the verb as a reflection of the deleted subject of the structure. The interpretation of the null pro subject in Najdi Arabic depends on the antecedent of the null pronominal that values T’s D-feature. When the A-topic values the D-feature, then a definite third person null subject structure results in the derived structure.
