A group of people are sitting on the top of a boat.
The people are about to go sailing.
Sitting on top of a boat does not imply about to go sailing.
exists e1 x1 x2 x3 x4.(n_top(x3) & on(e1,x3) & of(x3,x4) & n_boat(x4) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 s1 x1.(n_people(x1) & Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_go(e1) & n_sailing(x2)))