Did It Happen? The Pragmatic Complexity of Veridicality Assessment Marie-Catherine de Marneffe author Christopher D Manning author Christopher Potts author 2012-06 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal de-marneffe-etal-2012-happen 10.1162/COLI_a_00097 https://aclanthology.org/J12-2003/ 2012-06 38 2 301 333