A man in his boat on the lake
A man is fishing from his boat.
Being in a boat on the lake does not imply that the man is fishing.
exists x1 x2 x3.(n_lake(x3) & a_topic(x1) & in(x1,x2) & on(x2,x3) & n_boat(x2) & of(x2,x1) & n_male(x1) & n_man(x1))
exists e1 x1 x2.(from(e1,x2) & n_boat(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_fish(e1) & n_man(x1))