['he', 'welcome', 'they', 'EmptyParameter', 'EmptyParameter'] ['they', 'stay', 'EmptyParameter', 'while', 'for']
['<PRP>', 'judgment-33.1', '<PRP>', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'seem-109', 'EmptyParameter', "Synset('time_period.n.01')", 'for']
He welcomes them to stay for a while.
<PRP> welcomes <PRP> to stay for a Synset('time_period.n.01').