The young girl is sitting on the swing seat waiting for the carnival ride to begin.
A girl is sitting in a red swing.
A girl does not have to be young.  A swing does not have to be red.
exists e1 e2 p1 s1 s2 x1 x2 x3 x4.(n_ride(x4) & a_carnival(s2) & Theme(s2,x4) & n_seat(x2) & of(x2,x3) & n_swing(x3) & n_girl(x1) & a_young(s1) & Theme(s1,x1) & for(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_wait(e2) & exists e3.(Actor(e3,x4) & v_begin(e3)) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))
exists e1 s1 x1 x2.(in(e1,x2) & n_swing(x2) & a_red(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1))