a dog runs across the grass.
A dog is playing in the yard.
The dog running is not necessarily in the yard.
exists e1 x1 x2.(n_grass(x2) & across(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2.(n_yard(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1))