A man is cruising through a dirty river on a long boat.
The man is fishing on the river.
Just because a man is in a boat on the river does not mean he is fishing.
exists e1 s1 s2 x1 x2 x3.(through(e1,x2) & on(x2,x3) & n_boat(x3) & a_long(s2) & Theme(s2,x3) & n_river(x2) & a_dirty(s1) & Theme(s1,x2) & Actor(e1,x1) & v_cruise(e1) & n_man(x1))
exists e1 x1 x2.(n_river(x2) & n_man(x1) & on(e1,x2) & Actor(e1,x1) & v_fish(e1))