A person skiing down a hill.
A person is in the snow.
A person is skiing down a hill in the snow.
exists x1 x2 x3.(a_topic(x1) & down(x1,x3) & n_hill(x3) & Time(x1,x2) & n_skiing(x2) & n_person(x1))
exists p1 x1 x2.(n_snow(x2) & in(x1,x2) & n_person(x1))