['everyone', 'join', 'he', 'EmptyParameter', 'EmptyParameter']
["Synset('person.n.01')", 'cooperate-73.1-1', '<PRP>', 'EmptyParameter', 'EmptyParameter']
Soon, everyone in the room joins him.
Soon, Synset('person.n.01') in the Synset('social_group.n.01') joins <PRP>.