A boy on a skateboard balances on a red beam.
The beam is firmly in place.
A skateboard balances on a red beam, so the beam must be firmly in place so people can do that.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_beam(x3) & a_red(s1) & Theme(s1,x3) & Actor(e1,x1) & v_balance(e1) & on(x1,x2) & n_skateboard(x2) & n_boy(x1))
exists p1 s1 x1.(n_beam(x1) & a_firmly(s1) & Manner(p1,s1) & exists x2.(in(x1,x2) & n_place(x2)))