['he', 'wonder', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['he', 'do', 'EmptyParameter', 'it', 'about']
['<PRP>', 'marvel-31.3', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'act-114', 'EmptyParameter', '<PRP>', 'about']
He wonders what he should do about it.
<PRP> wonders what <PRP> should do about <PRP>.