['he', 'work', 'EmptyParameter', 'it', 'on']
['<PRP>', 'work-73.2', 'EmptyParameter', '<PRP>', 'on']
He could work on it, but very impressed by his level 5 in thermionic conversion.
<PRP> could work on it, but very impressed by <PRP> <NUMBER>5 in Synset('thermionic.a.01') Synset('problem_solving.n.02').