Children are canoeing on a beautiful lake.
Kids are playing in a canoe
Children canoeing does not imply they are playing.
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 e1 x1 x2.(in(e1,x2) & n_canoe(x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))