A shirtless young boy rides his skateboard over steps.
There is a shirtless boy skateboarding.
USING HIS SKATEBOARD MEANS HE IS SKATEBOARDING.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & over(x2,x3) & n_step(x3) & n_skateboard(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & a_young(s2) & Theme(s2,x1) & a_shirtless(s1) & Theme(s1,x1))
exists p1 x1 s1 x2 x3.((x1 = x2) & n_skateboarding(x2) & of(x2,x3) & n_boy(x3) & a_shirtless(s1) & Theme(s1,x2))