A dog runs through the grass.
A dog plays with his master.
WE DON'T KNOW WHY THE DOG IS RUNNING.  WE CANNOT ASSUME HE IS PLAYING WITH HIS MASTER.
exists e1 x1 x2.(n_grass(x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2.(with(e1,x2) & n_master(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_play(e1) & n_dog(x1))