The little girl is walking a beam in gymnastics class.
The girl is going to do a trick on the balance beam.
Being on the beam could be a first try and does not suggest being trained to do a trick.
exists e1 s1 x1 x2 x3 x4.(n_girl(x1) & a_little(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & in(x2,x3) & n_class(x3) & of(x3,x4) & n_gymnastics(x4) & n_beam(x2))
exists e1 p1 x1 x3 x4.(n_beam(x3) & of(x3,x4) & n_balance(x4) & n_girl(x1) & Topic(e1,p1) & Actor(e1,x1) & v_go(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_do(e2) & on(x2,x3) & n_trick(x2)))