Two dogs tied to a tree.
The dogs are having sex.
Dogs that are having sex will not be tied to a tree.
exists e1 x1 x2.(to(e1,x2) & n_tree(x2) & Theme(e1,x1) & v_tie(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_sex(x2))