['he', 'hear', 'something', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'see-30.1', "Synset('entity.n.01')", 'EmptyParameter', 'EmptyParameter']
Suddenly, he hears something odd.
Suddenly, <PRP> hears Synset('entity.n.01') Synset('odd.a.01').