A man in a black wetsuit on a surfboard.
A man is in the ocean on a surfboard.
Just because the man in a black wetsuit is on a surfboard does not mean he is in the ocean.
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x2) & on(x2,x3) & n_surfboard(x3) & n_wetsuit(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists p1 x1 x2.(n_ocean(x2) & exists x3.(in(x1,x2) & on(x2,x3) & n_surfboard(x3)) & n_man(x1))