['he', 'understand', 'that', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'comprehend-87.2', 'that', 'EmptyParameter', 'EmptyParameter']
After a month with only The Doctor for company he can understand that.
after <DURATION>0 with only <PERSON>2 for Synset('work_force.n.01') <PRP> can understand that.