Two dogs wrestle in a field.
Two dogs are wrestling for a bone
When two wrestle together, it need not always be for a bone.
exists e1 x1 x2.(in(e1,x2) & n_field(x2) & Actor(e1,x1) & v_wrestle(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(for(e1,x2) & n_bone(x2) & Actor(e1,x1) & v_wrestle(e1) & n_dog(x1) & card_eq_2(x1))