Three people are standing on a hill that is partly covered in snow.
Three people have been sledding down the hill on a snowy day.
Just because people are standing on a hill partly covered in snow doesn't mean the people have been sledding down the hill. It doesn't need to be a snowy day for a hill to be partly covered in snow.
exists e1 e2 s1 x1 x2 x3 x4.(on(e1,x2) & a_partly(s1) & Manner(e2,s1) & in(e2,x4) & n_snow(x4) & Theme(e2,x3) & v_cover(e2) & (x2 = x3) & n_hill(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_3(x1))
exists e1 s1 s2 x1 x2 x3.(n_hill(x2) & on(e1,x3) & n_day(x3) & a_snowy(s2) & Theme(s2,x3) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_sled(e1) & n_people(x1) & card_eq_3(x1))