A bird flying pass the walkway.
a bird come down the walk
Flying pass the walkway is one way in which you could come down a walk.
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 e1 x1 x2 x3.(n_walk(x3) & a_topic(x1) & down(e1,x3) & Theme(e1,x2) & v_come(e1) & (x1 = x2) & n_bird(x1))