A man in a wetsuit is surfing on the ocean.
A man swimming
A man in wetsuit doesn't imply he is swimming.
exists e1 x1 x2 x3.(n_ocean(x3) & on(e1,x3) & Actor(e1,x1) & v_surf(e1) & in(x1,x2) & n_wetsuit(x2) & n_man(x1))
exists x1 x2.(a_topic(x1) & n_swimming(x1) & of(x1,x2) & n_man(x2))