A skier skiing down a large mountain
A skier fell down in the snow.
A skier falling down in the snow cannot be a skier skiing down a large mountain at the same time.
exists s1 x1 x2 x3.(a_topic(x1) & down(x1,x3) & n_mountain(x3) & a_large(s1) & Theme(s1,x3) & n_skiing(x1) & of(x1,x2) & n_skier(x2))
exists e1 s1 x1 x2.(n_snow(x2) & in(e1,x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_fall(e1) & n_skier(x1))