Two gondolas passing in a canal.
Two gondolas are sinking in the water.
two gondolas passing cannot also be sinking in water.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_canal(x3) & Actor(e1,x2) & v_pass(e1) & (x1 = x2) & n_gondola(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_water(x2) & in(e1,x2) & Actor(e1,x1) & v_sink(e1) & n_gondola(x1) & card_eq_2(x1))