['he', 'see', 'it', 'class', 'in']
['<PRP>', 'see-30.1-1-1', '<PRP>', "Synset('activity.n.01')", 'in']
He saw it once in his science class.
<PRP> saw <PRP> once in <PRP> Synset('cognition.n.01') Synset('activity.n.01').