A man in a black wetsuit on a surfboard.
a person is on a surfboard.
A man is a person and a wetsuit is often worn when surfing.
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.(exists x2.(on(x1,x2) & n_surfboard(x2)) & n_person(x1))