['he', 'know', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['he', 'go', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'comprehend-87.2', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'escape-51.1-1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
He doesn't know how long he will be gone.
<PRP> doesn't know how Synset('long.a.06') <PRP> will be gone.