A dog trying to catch a tennis ball.
There is at least one animal here that isn't a cat.
The animal that isn't a cat is a dog.
exists e1 p1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_try(e1) & exists e2 x3 x4.(Theme(e2,x3) & Actor(e2,x2) & v_catch(e2) & n_ball(x3) & of(x3,x4) & n_tennis(x4)) & (x1 = x2) & n_dog(x1))
exists p1 x1 e1 x2 x3.((x1 = e1) & -exists p2 x4.((x3 = x4) & n_cat(x4)) & (e1 = x3) & a_at(e1) & Actor(e1,x2) & v_least(e1) & r_here(x2) & n_animal(x2) & card_eq_1(x2))