Someone in yellow pants is on a ramp over the snow.
Someone in yellow pants is skiing.
Just because someone is on a ramp over the snow does not mean that he is skiing.
exists p1 s1 x1 x2 x4.(n_snow(x4) & exists x3.(on(x1,x3) & over(x3,x4) & n_ramp(x3)) & in(x1,x2) & n_pants(x2) & a_yellow(s1) & Theme(s1,x2) & n_person(x1))
exists p1 s1 x1 x2.(exists x3.((x1 = x3) & n_skiing(x3)) & in(x1,x2) & n_pants(x2) & a_yellow(s1) & Theme(s1,x2) & n_person(x1))