['he', 'explain', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['what', 'happen', 'EmptyParameter', 'he', 'to'] ['he', 'hear', 'voice', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'transfer_mesg-37.1.1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['what', 'occur-48.3-1', 'EmptyParameter', '<PRP>', 'to'] ['<PRP>', 'discover-84', "Synset('linguistic_relation.n.01')", 'EmptyParameter', 'EmptyParameter']
He can not explain what happened to him when he heard her voice.
<PRP> can not explain what happened to <PRP> when <PRP> heard <PRP> Synset('linguistic_relation.n.01').