A man sitting on an empty train
A man is traveling to see his girlfriend
Just because, a man is sitting on an empty train does not imply that the man is traveling to see his girlfriend.
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_train(x3) & a_empty(s1) & Theme(s1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_travel(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_see(e2)) & n_girlfriend(x2) & of(x2,x1) & n_male(x1) & n_man(x1))