Morphological Complexity within and across Boundaries

This paper argues that phonologically null arguments in Turkish Sign Language (henceforth, TİD) are licensed as discourse topic(s). We observe that both null subjects and objects are licensed by both plain and agreeing verbs as well as classifiers. Moreover, we show that null arguments of both plain and agreeing verbs behave the same in syntactic environments, i.e. islands, across-the-board extractions and long distance topicalization constructions. We suggest that phonologically null arguments