Two dogs wrestle in the grass.
Two dogs are fighting over a bone.
Just because  Two dogs wrestle in the grass does not mean they were fighting over a bone.
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_wrestle(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(over(e1,x2) & n_bone(x2) & Actor(e1,x1) & v_fight(e1) & n_dog(x1) & card_eq_2(x1))