Two individuals are looking down the bridge.
The train is crossing the bridge.
We don't know if the train is necessarily crossing.
exists e1 x1 x2.(n_bridge(x2) & down(e1,x2) & Actor(e1,x1) & v_look(e1) & n_individual(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_bridge(x2) & n_train(x1) & Theme(e1,x2) & Actor(e1,x1) & v_cross(e1))