A girls is jumping in the sand.
A boy is swimming in the ocean.
Girls cannot be a boy and jumping is not swimming.
exists e1 x1 x2.(n_sand(x2) & in(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_girl(x1))
exists e1 x1 x2.(n_ocean(x2) & in(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_boy(x1))