Two people skiing in the snow.
There are people skiing.
People could include two or more.  Skiing is using done on snow.
exists x1 x2 x3.(n_snow(x3) & a_topic(x1) & in(x1,x3) & Time(x1,x2) & n_skiing(x2) & n_people(x1) & card_eq_2(x1))
exists p1 x1 x2 x3.((x1 = x2) & Time(x2,x3) & n_skiing(x3) & n_people(x2))