Spectators watch as a snowboarder does a trick.
The spectators watch as a snowboarder plays basketball with his friends.
The snowboarder is either doing a trick, presumably on his snowboard, playing basketball with his friends. He cannot be doing both.
exists e1 p1 x1 x2.(exists e2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_do(e2) & n_trick(x4) & n_snowboarder(x3)) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_thing(x2) & n_spectator(x1))
exists e1 p1 x1 x2 x5.(n_friend(x5) & of(x5,x1) & n_male(x1) & n_spectator(x1) & exists e2 x3 x4.(with(e2,x5) & Theme(e2,x4) & Actor(e2,x3) & v_play(e2) & n_basketball(x4) & n_snowboarder(x3)) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_thing(x2))