['they', 'use', 'race', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'use-105.1', "Synset('biological_group.n.01')", 'EmptyParameter', 'EmptyParameter']
They used to be a race dying from ecological disasters.
<PRP> used to be a Synset('biological_group.n.01') dying from Synset('ecological.a.02') Synset('misfortune.n.02').