Two children jumping in potato sacks.
Two children are jumping up and down.
Jumping  is action where  person moves up and down.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & n_sack(x3) & of(x3,x4) & n_potato(x4) & Actor(e1,x2) & v_jump(e1) & (x1 = x2) & n_child(x1) & card_eq_2(x1))
exists e2 e1 s1 s2 x1 x2.(a_down(s2) & Manner(e2,s2) & Actor(e2,x2) & v_jump(e2) & n_child(x2) & card_eq_2(x2) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_jump(e1) & n_child(x1) & card_eq_2(x1))