Skater riding skateboard on a quarter pipe while the crowd watches.
Skater sitting on the grass.
Skater is either riding a skateboard or sitting on the grass.
(x)
exists e1 x1 x2.(n_grass(x2) & ne_nam_skater(x1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))