Two boys playing on a trampoline.
A trampoline with two boys on it.
Two boys on trampoline implies two boys on it.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_trampoline(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))
exists x1 x2.(a_topic(x1) & with(x1,x2) & on(x2,x1) & n_thing(x1) & n_boy(x2) & card_eq_2(x2) & n_trampoline(x1))