A group of people watches a boy on a skateboard launch off a ramp.
The boy will be performing a trick.
Launching off a ramp does  not mean he will be performing a trick.
exists e1 x1 x2 x3 x4 x5 x6.(off(e1,x6) & n_ramp(x6) & on(e1,x4) & n_launch(x4) & of(x4,x5) & n_skateboard(x5) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & n_boy(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2))