A boy is sitting on a black boat with two flags on long poles.
The boy is riding on the boat.
sitting on a boat shows that the boy is riding on a boat
exists e1 s1 s2 x1 x2 x3 x4.(with(e1,x3) & on(x3,x4) & n_pole(x4) & a_long(s2) & Theme(s2,x4) & n_flag(x3) & card_eq_2(x3) & on(e1,x2) & n_boat(x2) & a_black(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1))
exists e1 x1 x2.(n_boat(x2) & n_boy(x1) & on(e1,x2) & Actor(e1,x1) & v_ride(e1))