Three dogs are playing in the grass.
Three dogs are playing with a stick.
Just because the dogs are playing in the grass, it doesn't indicate that they are playing with a stick.
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_3(x1))
exists e1 x1 x2.(with(e1,x2) & n_stick(x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_3(x1))