['he', 'stop', 'think', 'EmptyParameter', 'EmptyParameter'] ['he', 'do', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'forbid-64.4-1', 'consider-29.9-2', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'act-114', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
He can not stop thinking about what he did.
<PRP> can not stop thinking about what <PRP> did.