Three little boys on a float in a river.
3 boys re-enact the adventure of huckleberry finn
Being in a river doesn't necessarily mean they are there to re-enact the adventure of huckleberry finn.
exists s1 x1 x2 x3.(a_topic(x1) & on(x1,x2) & in(x2,x3) & n_river(x3) & n_float(x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1) & card_eq_3(x1))
exists e1 x1 x2 x3 x4.(n_adventure(x2) & Theme(e1,x2) & Actor(e1,x1) & v_re-enact(e1) & of(x2,x3) & n_finn(x3) & of(x3,x4) & n_huckleberry(x4) & n_boy(x1) & n_date(x1) & a_date_day_03(x1) & a_date_day_03(x1))