A boy in blue jumps on a skateboard while two others watch him
A boy in blue is doing stunts in a skateboard competition
Doing stunts on a skateboard while being watched does not necessarily mean that you're in a skateboard competition.
(x)
exists e1 x1 x2 x3 x4 x5.(in(e1,x4) & n_competition(x4) & of(x4,x5) & n_skateboard(x5) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_stunt(x3) & in(x1,x2) & n_blue(x2) & n_boy(x1))