['she', 'threaten', 'fire', 'EmptyParameter', 'EmptyParameter'] ['she', 'fire', 'EmptyParameter', 'he', 'on']
['<PRP>', 'amuse-31.1', 'fire-10.10', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'fire-10.10', 'EmptyParameter', '<PRP>', 'on']
She threatens to fire on him.
<PRP> threatens to fire on <PRP>.