Two boys are playing on a trampoline.
The kids are jumping up and down
Boys are kids and they are playing on a trampoline which implies they are jumping up and down.
exists e1 x1 x2.(on(e1,x2) & n_trampoline(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_2(x1))
exists e1 e2 s1 s2 x1.(n_kid(x1) & a_down(s2) & Manner(e2,s2) & Actor(e2,x1) & v_jump(e2) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_jump(e1))