Two boys lie on the ground and laugh.
the kids sit on the ground together
Boys are kids and if they lie on the ground they are on the ground together therefore if  two boys lie on the ground and laugh it implies that the kids sit on the ground together
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 s1 x1 x2.(n_ground(x2) & n_kid(x1) & a_together(s1) & Manner(e1,s1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))