['you', 'see', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['he', 'do', 'EmptyParameter', 'station', 'on']
['<PRP>', 'see-30.1-1-1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'act-114', 'EmptyParameter', "Synset('frequency.n.01')", 'on']
You saw what he did on the station.
<PRP> saw what <PRP> did on the Synset('frequency.n.01').