In this section, we evaluate the original PredPatt (PredPatt v1) and the improved PredPatt (PredPatt v2) on the English Web Treebank (EWT) and the Wall Street Journal corpus (WSJ), and compare their performance with four prominent Open IE systems: OpenIE 4, 6 OLLIE (Mausam et al., 2012) , ClausIE (Del Corro and Gemulla, 2013) , and Stanford Open IE<cite> (Angeli et al., 2015)</cite> .