A person is crossing the street.
The person is looking at traffic.
Crossing the street does not imply looking at traffic.
exists e1 x1 x2.(n_street(x2) & Theme(e1,x2) & Actor(e1,x1) & v_cross(e1) & n_person(x1))
exists e1 x1 x2.(n_person(x1) & at(e1,x2) & n_traffic(x2) & Actor(e1,x1) & v_look(e1))