a man walks across the tightrope.
This guy works as a circus performer.
Sentence 1 is missing circus performer.
exists e1 x1 x2.(n_tightrope(x2) & across(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_guy(x1) & as(e1,x2) & n_performer(x2) & of(x2,x3) & n_circus(x3) & Actor(e1,x1) & v_work(e1))