A person in orange pants is doing tricks on a snowboard while a person in a yellow cap watches.
Nobody has pants on
A person cannot be on a snowboard (without pants) and simultaneously there be nobody with pants on
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(in(e1,x7) & n_watch(x7) & of(x7,x8) & n_cap(x8) & a_yellow(s1) & Theme(s1,x7) & while(e1,x6) & n_person(x6) & on(e1,x5) & n_snowboard(x5) & Theme(e1,x4) & Actor(e1,x1) & v_do(e1) & n_trick(x4) & in(x1,x2) & n_pants(x2) & of(x2,x3) & n_orange(x3) & n_person(x1))
-exists e1 s1 x1 x2.(a_on(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_pants(x2) & n_person(x1))