Person observing a river with a bridge going over it.
A person looking at a river
Looking is a rephrasing of observing.
exists e2 e1 x1 x2 x3 x4.(ne_nam_person(x1) & with(e1,x3) & over(e2,x2) & n_thing(x2) & Actor(e2,x4) & v_go(e2) & (x3 = x4) & n_bridge(x3) & Theme(e1,x2) & Actor(e1,x1) & v_observe(e1) & n_river(x2))
exists e1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_river(x3) & Actor(e1,x2) & v_look(e1) & (x1 = x2) & n_person(x1))