Two boys lie on the ground and laugh.
the kids sit on the ground on a school day
not all boys sit and lie on ground
exists e1 x1 x2 x3 x4.(n_laugh(x4) & n_ground(x3) & subset_of(x4,x2) & subset_of(x3,x2) & on(e1,x2) & Actor(e1,x1) & v_lie(e1) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(n_ground(x2) & n_kid(x1) & on(e1,x3) & n_day(x3) & of(x3,x4) & n_school(x4) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))