Nevertheless, the situation with dependency-based SRL has not changed: even recent state-of-the-art methods for this task heavily rely on syntactic features (Roth and Lapata, 2016;FitzGerald et al., 2015;Lei et al., 2015;Roth and Woodsend, 2014;Swayamdipta et al., 2016).
roth and Lapata (2016) argue that syntactic features are necessary for the dependency-based SrL and show that performance of their model degrades dramatically if syntactic paths between arguments and predicates are not provided as an input.