A boy is being covered in sand at the beach.
The boy is covered by a blanket.
covered in sand is not the same as covered by a blanket
exists e1 x1 x2 x3.(n_beach(x3) & in(e1,x2) & at(x2,x3) & n_sand(x2) & Theme(e1,x1) & v_cover(e1) & n_boy(x1))
exists e1 x1 x2.(n_boy(x1) & Actor(e1,x2) & n_blanket(x2) & Theme(e1,x1) & v_cover(e1))