a girl sits on a swing ride.
A girl is swinging.
If a girl is sitting on a swing, then it is implied that she is swinging.
exists e1 x1 x2 x3.(on(e1,x2) & n_ride(x2) & of(x2,x3) & n_swing(x3) & Actor(e1,x1) & v_sit(e1) & n_girl(x1))
exists e1 x1.(Actor(e1,x1) & v_swing(e1) & n_girl(x1))