Left dislocation (ld) is a very productive syntactic construction in persian, especially, in spoken language (dabir-moghaddam, 1992 s a topic-promoting construction and its leftdislocated constituent, depending on the previous discourse, could be 'aboutness secondary topic' or 'contrastive focus' which is normally marked with postpositon '-ra'. Ld as an abstract construction is inherited by less abstract constructions and also inherits some properties from more abstract ones (or is motivated). Consequently, the theory could locate the position of ldc in the hierarchical network of constructions in the mind of persian speakers.