a dog trots through the grass.
A dog is chasing a cat.
Trotting through the grass doesn't mean you're chasing a cat.
exists e1 x1 x2.(n_grass(x2) & through(e1,x2) & Actor(e1,x1) & v_trot(e1) & n_dog(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_cat(x2) & n_dog(x1))