A man and a boy on horses attempting to rope a cow.
The cows are on a train.
A man and a boy are not cows.
exists e1 p1 s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & on(x2,x3) & Topic(e1,p1) & Actor(e1,x4) & v_attempt(e1) & exists e2 x5.(Theme(e2,x5) & Actor(e2,x4) & v_rope(e2) & n_cow(x5)) & (x3 = x4) & n_horse(x3) & n_boy(x2) & subset_of(x1,s1) & n_man(x1))
exists p1 x1.(n_cow(x1) & exists x2.(on(x1,x2) & n_train(x2)))