The kid is showing off on his skateboard in front of a large crowd.
The kid is riding his skateboard at a skateboarding show.
Showing off does not imply being at a skateboarding show.
exists e1 s1 s2 x1 x2 x3 x4.(n_skateboard(x2) & of(x2,x1) & n_male(x1) & n_kid(x1) & a_off(s2) & Manner(e1,s2) & on(e1,x2) & in(x2,x3) & of(x3,x4) & n_crowd(x4) & a_large(s1) & Theme(s1,x4) & n_front(x3) & Actor(e1,x1) & v_show(e1))
exists e1 x1 x2 x3 x4.(n_skateboard(x2) & of(x2,x1) & n_male(x1) & n_kid(x1) & at(e1,x3) & n_show(x3) & of(x3,x4) & n_skateboarding(x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1))