Two boys lie on the ground and laugh.
the pigs eat lice
Pigs are not boys.
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.(n_pig(x1) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_louse(x2))