A lady is writing on a board.
The lady is swimming in the ocean.
The lady is writing, not swimming in the ocean.
exists e1 x1 x2.(on(e1,x2) & n_board(x2) & Actor(e1,x1) & v_write(e1) & n_lady(x1))
exists e1 x1 x2.(n_ocean(x2) & n_lady(x1) & in(e1,x2) & Actor(e1,x1) & v_swim(e1))