The ground is covered in snow.
The snow is all white.
A ground covered in snow is all white.
exists e1 x1 x2.(n_ground(x1) & in(e1,x2) & n_snow(x2) & Theme(e1,x1) & v_cover(e1))
exists s1 x1.(n_snow(x1) & r_all(s1) & Theme(s1,x1) & a_white(s1))