Two children run and play in the grass.
Two young boys play in the grass.
Not all children are young boys.
exists e1 e2 x1 x2 x3.(n_grass(x3) & in(e2,x3) & Actor(e2,x2) & v_play(e2) & n_child(x2) & card_eq_2(x2) & Actor(e1,x1) & v_run(e1) & n_child(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))