The idiosyncratic preposition zai in Mandarin Chinese and differential argument marking

In this paper, I focus on the Mandarin spatial preposition zai (‘at’), which can appear in the VP domain, like other spatial prepositions, but which can also appear in the TP domain, where it’s presence or absence is sensitive to the animacy and definiteness properties of its object. I argue that zai’s distribution and behavior in the TP domain is expected if it functions as a differential argument marker triggered by internal topicalization of its object. Implications of the current analysis for the internal structure of spatial PPs are also considered.