A dog runs in a grassy field.
A dog is running across a field of grass.
A field of grass is a restatement of a grassy field.
exists e1 s1 x1 x2.(in(e1,x2) & n_field(x2) & a_grassy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2 x3.(across(e1,x2) & of(x2,x3) & n_grass(x3) & n_field(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))