A boy on a chained swing looks to the right and smiles.
There is a boy in a red shirt playing on a swing.
The boy may be in another activity and not playing.  Boys do not always wear a red shirt.
exists e1 s1 x1 x2 x3 x4 x5.(n_smile(x5) & n_right(x4) & subset_of(x5,x3) & subset_of(x4,x3) & to(e1,x3) & Actor(e1,x1) & v_look(e1) & on(x1,x2) & n_swing(x2) & a_chained(s1) & Theme(s1,x2) & n_boy(x1))
exists p1 x1 e1 s1 x2 x3 x4 x5.((x1 = x2) & in(x2,x3) & on(e1,x5) & n_swing(x5) & Actor(e1,x4) & v_play(e1) & (x3 = x4) & n_shirt(x3) & a_red(s1) & Theme(s1,x3) & n_boy(x2))