A bird flying pass the walkway.
a natural creature walking
The bird can not fly pass the walkway and be walking at the same time.
exists e2 e1 x1 x2 x3.(n_walkway(x3) & Theme(e2,x3) & Actor(e2,x1) & v_pass(e2) & Actor(e1,x2) & v_fly(e1) & (x1 = x2) & n_bird(x1))
exists s1 x1 x2.(a_topic(x1) & n_walking(x1) & of(x1,x2) & n_creature(x2) & a_natural(s1) & Theme(s1,x1))