Some skiers at a resort.
The skiiers are at a resort.
some skiers implies skiiers
exists x1 x2.(a_topic(x1) & at(x1,x2) & n_resort(x2) & n_skier(x1))
exists p1 x1.(n_skiier(x1) & exists x2.(at(x1,x2) & n_resort(x2)))