A traveler on a snowy road
An individual drives on a slick surface.
Not all snowy roads are slick.
exists s1 x1 x2.(a_topic(x1) & on(x1,x2) & n_road(x2) & a_snowy(s1) & Theme(s1,x2) & n_traveler(x1))
exists s1 s2 x1 x2.(a_topic(x1) & on(x1,x2) & n_surface(x2) & a_slick(s2) & Theme(s2,x2) & n_drive(x1) & a_individual(s1) & Theme(s1,x1))