The structural nature of non-structural case: On passivization and case in Lithuanian

Dative case on indirect objects (IO) in Lithuanian is preserved under passivization, which is not the case with dative direct objects (DO) of monotransitive verbs, suggesting that the two datives are not alike. Although DAT-to-NOM conversion is taken as an indicator of structural case, we show that DO datives behave differently from DOs bearing structural accusative in that the former exhibit inherent case properties as well (see also Anderson 2015). We develop an account for the contrast between the two datives by using two types of derivational mechanisms: structure-building features, triggering Merge, and probe features, triggering Agree (Heck & Muller 2007; Muller 2010). This study demonstrates that structural vs. non-structural conversion can be dependent on not only how case is assigned but also on the Voice system of a language (in line with Alexiadou et al. 2014). We argue that the DO dative in Lithuanian is in fact non-structural. Even though the result of DAT-to-NOM conversion is structural nominative case, the derivation is different from that of structural ACC-to-NOM conversion.