A yellow dog plays with a large stick in the grass.
A dog is playing.
Playing with a large stick is the same thing as playing.
exists e1 s1 s2 x1 x2 x3.(n_grass(x3) & with(e1,x2) & in(x2,x3) & n_stick(x2) & a_large(s2) & Theme(s2,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & a_yellow(s1) & Theme(s1,x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_dog(x1))