Girl swinging on a swing outside in a wooded area.
A girl is swinging
The phrase "is swinging" is just rephrasing "swinging on a swing."
exists e1 s1 x1 x2 x3 x4.(ne_nam_girl(x1) & on(e1,x2) & in(x2,x4) & n_area(x4) & a_wooded(s1) & Theme(s1,x4) & n_outside(x2) & of(x2,x3) & n_swing(x3) & Actor(e1,x1) & v_swing(e1))
exists e1 x1.(Actor(e1,x1) & v_swing(e1) & n_girl(x1))