A boy in blue jumps on a skateboard while two others watch him
A boy is sitting on his butt on the skateboard as others watch.
Jumps on a skateboard is a different action than sitting.
(x)
exists e2 e1 x1 x2 x3 x4 x5 x6.(n_skateboard(x4) & Theme(e2,x6) & Actor(e2,x1) & v_watch(e2) & n_thing(x6) & on(e1,x4) & as(x4,x5) & -(x5 = x1) & n_person(x1) & n_person(x5) & on(e1,x3) & n_butt(x3) & of(x3,x1) & n_male(x1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_boy(x1))