A man is rollerblading down a rail.
There is a man rollerblading.
Rollerblading down a rail is rollerblading.
exists e1 s1 x1 x2.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_rollerblade(e1) & n_rail(x2) & n_man(x1))
exists p1 x1 x2 x3.((x1 = x2) & n_rollerblading(x2) & of(x2,x3) & n_man(x3))