“…For example, unlike their monolingual counterparts, heritage speakers often display a relatively better command of phonological and syntactic aspects of their heritage languages than of lexical, morphological, and morphosyntactic areas (Bar-Shalom & Zaretsky, 2008; Montrul, 2004; Silva-Corvalán, 1994, 2003; Sorace, 2000; Tsimpli & Sorace, 2006). Likewise, it has been reported that, even within a single linguistic area, they are often more accurate in deploying unmarked forms than in using marked categories (Albirini, Benmamoun & Saadah, 2011; Cornips & Hulk, 2006; Laleko, 2010; Polinsky, 1997; Suh, 2008). These asymmetries have generated considerable interest in understanding the properties of heritage grammars that are prone to incomplete acquisition or attrition/loss as well as the underlying causes of their non-convergent acquisition or retention patterns.…”