Skiiers at the top of a snow covered hill.
Skiiers prepare to zoom down the mountain.
They may not be on the mountain. Also, they can be on the hill but not prepare to zoom down.
exists e1 x1 x2 x3 x4.(n_top(x2) & a_topic(x1) & at(x1,x2) & of(x2,x3) & n_hill(x3) & Theme(e1,x3) & v_cover(e1) & of(x3,x4) & n_snow(x4) & n_skiier(x1))
exists e1 p1 x1 x2.(n_mountain(x2) & Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 s1.(a_down(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_zoom(e2)) & n_skiier(x1))