The skier moves down the hill on a beautiful day.
The skier is smiling while moving down the hill.
One cannot tell from the first sentence whether or not the skier is smiling.
exists e1 s1 x1 x2 x3.(n_hill(x2) & n_skier(x1) & down(e1,x2) & on(x2,x3) & n_day(x3) & a_beautiful(s1) & Theme(s1,x3) & Actor(e1,x1) & v_move(e1))
exists e2 e1 s1 x1 x2.(n_hill(x2) & n_skier(x1) & while(e1,e2) & a_down(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_move(e2) & Actor(e1,x1) & v_smile(e1))