['he', 'know', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['she', 'be', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'comprehend-87.2', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'seem-109', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
He didn't know who she was.
<PRP> didn't know who <PRP> was.