A snowboarder sits on a slope with skiers and boarders nearby.
On a slope, someone is sitting down.
Snowboarder may be implied as someone.
exists e1 s1 x1 x2 x3 x4 x5.(a_nearby(s1) & Manner(e1,s1) & with(e1,x3) & subset_of(x5,x3) & n_boarder(x5) & subset_of(x4,x3) & n_skier(x4) & on(e1,x2) & n_slope(x2) & Actor(e1,x1) & v_sit(e1) & n_snowboarder(x1))
exists e1 s1 x1 x2.(on(e1,x2) & n_slope(x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_person(x1))