The ground is covered in snow.
The ground on aa very hot day.
There is no snow when it is a very hot day.
exists e1 x1 x2.(n_ground(x1) & in(e1,x2) & n_snow(x2) & Theme(e1,x1) & v_cover(e1))
exists s1 x1 x2 x3.(n_ground(x1) & a_topic(x1) & on(x1,x2) & n_day(x2) & a_hot(s1) & Theme(s1,x2) & r_very(x2) & of(x2,x3) & n_aa(x3))