Someone in yellow pants is on a ramp over the snow.
Someone is wearing clean yellow pants.
You cannot infer that the pants are clean from what is said in sentence 1.
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 e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_pants(x2) & a_yellow(s2) & Theme(s2,x2) & a_clean(s1) & Theme(s1,x2) & n_person(x1))