Two children lay in the grass.
The kids played in the grass.
Kids is a synonym for children.
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_lay(e1) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_grass(x2) & n_kid(x1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))