A boy sitting and playing in the sand.
The adults jump into the ocean.
The boy is one person and considered to be a child, who sits and plays in the sand.  He is not the same as adults who jump into the ocean.
exists e1 e2 x1 x2 x3.(n_sand(x3) & in(e2,x3) & Actor(e2,x2) & v_play(e2) & n_boy(x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1))
exists e1 x1 x2.(n_ocean(x2) & n_adult(x1) & into(e1,x2) & Actor(e1,x1) & v_jump(e1))