['he', 'trap', 'EmptyParameter', 'trunk', 'by']
['<PRP>', 'pocket-9.10', 'EmptyParameter', "Synset('case.n.05')", 'by']
He is trapped by a large tree trunk.
<PRP> is trapped by a Synset('large.a.01') Synset('figure.n.06') Synset('case.n.05').