One dog is trying to bite another.
A dog and a cat are fighting.
The dog trying to bite another means there are two dogs, and not a dog with a cat.
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_bite(e2) & n_thing(x2)) & n_dog(x1) & card_eq_1(x1))
exists e1 x1 x2 x3.(Actor(e1,x1) & v_fight(e1) & subset_of(x3,x1) & n_cat(x3) & subset_of(x2,x1) & n_dog(x2))