Two children are laughing in the grass.
Some children are crying in the grass.
Two children laughing in the grass are not necessarily crying.
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_laugh(e1) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_cry(e1) & n_child(x1))