Three young boys sitting outside are looking at something obscured between them.
Three little boys are playing together on the ground.
Just because they are together doesn't mean they are playing.  Sitting outside doesn't necessarily mean they are on the ground.
exists e1 e3 e2 s1 s2 x1 x2 x3 x4.(at(e2,x3) & between(e3,x1) & n_thing(x1) & Theme(e3,x4) & v_obscure(e3) & (x3 = x4) & n_thing(x3) & Actor(e2,x1) & v_look(e2) & a_outside(s2) & Manner(e1,s2) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_3(x1))
exists e1 s1 s2 x1 x2.(n_ground(x2) & on(e1,x2) & a_together(s2) & Manner(e1,s2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_little(s1) & Theme(s1,x1) & card_eq_3(x1))