A plane flies with a cloud of smoke behind it.
the plane is about to crash
A plane with a cloud of smoke isn't necessarily about to crash.
exists e1 x1 x2 x3.(behind(e1,x1) & n_thing(x1) & with(e1,x2) & of(x2,x3) & n_smoke(x3) & n_cloud(x2) & Actor(e1,x1) & v_fly(e1) & n_plane(x1))
exists p1 s1 x1.(n_plane(x1) & Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1.(Actor(e1,x1) & v_crash(e1)))