Man in a small white boat on a lake.
a person is out on the lake
A man being in a boat on a lake implies that there is a person on the lake.
exists s1 s2 x1 x2 x3.(a_topic(x1) & in(x1,x2) & on(x2,x3) & n_lake(x3) & n_boat(x2) & a_white(s2) & Theme(s2,x2) & a_small(s1) & Theme(s1,x2) & n_man(x1))
exists p1 s1 x1 x2.(n_lake(x2) & a_out(s1) & Manner(p1,s1) & on(x1,x2) & n_person(x1))