A person attempting a stunt using a snowboard and some wooden pallets while it is dark outside with snow on the ground.
A snowboard instructor is spending his evening after work trying to perfect a new move.
attempting a stunt using a snowboard and some wooden pallets while does not imply the person  is a snowboard instructor spending his evening after work trying to perfect a new move.
exists e1 e2 p1 s1 x1 x2 x3 x4 x5 x6 x8.(n_ground(x8) & a_topic(x1) & for(e1,e2) & exists s2 x7.(on(s2,x8) & with(s2,x7) & n_snow(x7) & r_outside(s2) & Theme(s2,x1) & a_dark(s2)) & n_thing(x1) & while(e2,p1) & Theme(e2,x4) & Actor(e2,x2) & v_use(e2) & subset_of(x6,x4) & n_pallet(x6) & a_wooden(s1) & Theme(s1,x6) & subset_of(x5,x4) & n_snowboard(x5) & Theme(e1,x3) & Actor(e1,x2) & v_attempt(e1) & n_stunt(x3) & (x1 = x2) & n_person(x1))
exists e1 e2 p1 x1 x2 x3 x4.(for(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_try(e2) & exists e3 s1 x5.(Theme(e3,x5) & Actor(e3,x1) & v_perfect(e3) & n_move(x5) & a_new(s1) & Theme(s1,x5)) & after(e1,x4) & n_work(x4) & Theme(e1,x3) & Actor(e1,x1) & v_spend(e1) & n_evening(x3) & of(x3,x1) & n_male(x1) & n_instructor(x1) & of(x1,x2) & n_snowboard(x2))