a skier skiing down a snowy mountainside
The snow is powdery.
Not all snow is powdery.
exists s1 x1 x2 x3.(a_topic(x1) & down(x1,x3) & n_mountainside(x3) & a_snowy(s1) & Theme(s1,x3) & n_skiing(x1) & of(x1,x2) & n_skier(x2))
exists p1 x1.(n_snow(x1) & exists x2.((x1 = x2) & n_powdery(x2)))