Two men on canoes on a lake.
Two men are fishing in canoes.
Just because men on canoes on a lake it does not mean they are fishing.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & on(x2,x3) & n_lake(x3) & n_canoe(x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(in(e1,x2) & n_canoe(x2) & Actor(e1,x1) & v_fish(e1) & n_man(x1) & card_eq_2(x1))