Two children playing in the sand.
Kids are playing in sand.
Children is a way to describe kids.
exists e1 x1 x2 x3.(n_sand(x3) & a_topic(x1) & in(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2.(in(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))