A man fly fishing.
A man is fishing.
Fly fishing is a type of fishing.
exists x1 x2 x3.(a_topic(x1) & n_fishing(x1) & of(x1,x3) & n_fly(x3) & of(x1,x2) & n_man(x2))
exists p1 x1.(exists x2.((x1 = x2) & n_fishing(x2)) & n_man(x1))