A man sitting in a boat is floating near a cave.
A person is outdoors on a boat.
The man is a person. Also, if he is on a boat in the water, he is outdoors.
exists e1 e2 x1 x2 x3 x4.(near(e2,x4) & n_cave(x4) & Actor(e2,x1) & v_float(e2) & in(e1,x3) & n_boat(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists p1 x1.(exists x2 x3.((x1 = x2) & on(x2,x3) & n_boat(x3) & n_outdoors(x2)) & n_person(x1))