Children are canoeing on a beautiful lake.
Children race their canoes on a beautiful lake.
Children canoeing does not imply they are in a race.
exists e1 s1 x1 x2.(on(e1,x2) & n_lake(x2) & a_beautiful(s1) & Theme(s1,x2) & Actor(e1,x1) & v_canoe(e1) & n_child(x1))
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & on(x1,x4) & n_lake(x4) & a_beautiful(s2) & Theme(s2,x4) & n_canoe(x1) & a_their(s1) & Theme(s1,x1) & of(x1,x3) & n_race(x3) & (x1 = x2) & ne_nam_children(x2))