Two young boys play besides a lake, throwing rocks into the water.
A group of adults are frolicking around for no reason.
Young boys are not adults.
exists e1 e2 s1 x1 x2 x3 x4.(n_water(x4) & for(e1,e2) & into(e2,x4) & Theme(e2,x3) & Actor(e2,x1) & v_throw(e2) & n_rock(x3) & besides(e1,x2) & n_lake(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(r_around(e1) & -exists x3.(for(e1,x3) & n_reason(x3)) & Actor(e1,x1) & v_frolic(e1) & of(x1,x2) & n_adult(x2) & n_group(x1))