['explosion', 'hear', 'EmptyParameter', 'man', 'by']
["Synset('sound.n.04')", 'discover-84', 'EmptyParameter', "Synset('person.n.01')", 'by']
Suddenly an explosion is heard by the two men.
suddenly an Synset('sound.n.04') is heard by the <NUMBER>0 Synset('person.n.01').