A kid is skateboarding on a handrail.
The kid does a skateboarding trick.
Skateboarding on a handrail is a skateboarding trick.
exists e1 x1 x2.(on(e1,x2) & n_handrail(x2) & Actor(e1,x1) & v_skateboard(e1) & n_kid(x1))
exists e1 x1 x2 x3.(n_kid(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & of(x2,x3) & n_skateboarding(x3))