A swan is flying above water.
the swan is fat
Not all swans are fat.
exists e1 x1 x2.(above(e1,x2) & n_water(x2) & Actor(e1,x1) & v_fly(e1) & n_swan(x1))
exists s1 x1.(n_swan(x1) & Theme(s1,x1) & a_fat(s1))